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Nun
  • (n.) A white variety of domestic pigeons having a veil of feathers covering the head.

    Nunatak
  • (n.) In Greenland, an insular hill or mountain surrounded by an ice sheet.

    Nunciature
  • (n.) The office of a nuncio.

    Nuncio
  • (n.) A messenger.

    Nuncupative
  • (a.) Nominal

    Nunnery
  • (n.) A house in which nuns reside

    Nuptial
  • (a.) Of or pertaining to marriage
  • (n.) Marriage

    Nurse
  • (n.) A lieutenant or first officer, who is the real commander when the captain is unfit for his place
  • (v. t.) To bring up

    Nursing
  • (a.) Supplying or taking nourishment from, or as from, the breast

    Nursling
  • (n.) One who, or that which, is nursed

    Nurture
  • (n.) That which nourishes
  • (v. t.) To educate

    Nutation
  • (n.) A very small libratory motion of the earth's axis, by which its inclination to the plane of the ecliptic is constantly varying by a small amount

    Nutcracker
  • (n.) A European bird (Nucifraga caryocatactes), allied to the magpie and crow. Its color is dark brown, spotted with white

    Nutgall
  • (n.) A more or less round gall resembling a nut, esp. one of those produced on the oak and used in the arts

    Nuthatch
  • (n.) Any one of several species of birds of the genus Sitta, as the European species (Sitta Europaea)

    Nutlet
  • (n.) A small nut

    Nutmeg
  • (n.) The kernel of the fruit of the nutmeg tree (Myristica fragrans), a native of the Molucca Islands, but cultivated elsewhere in the tropics

    Nutria
  • (n.) The fur of the coypu.

    Nutrient
  • (a.) Nutritious
  • (n.) Any substance which has nutritious qualities, i. e., which nourishes or promotes growth.

    Nutriment
  • (n.) That which nourishes

    Nutrition
  • (n.) In a more limited sense, the process by which the living tissues take up, from the blood, matters necessary either for their repair or for the performance of their healthy functions

    Nutritious
  • (a.) Nourishing

    Nutritive
  • (a.) Of or pertaining to nutrition

    Nutshell
  • (n.) A shell of the genus Nucula.

    Nuzzle
  • (v. i.) To go with head poised like a swine, with nose down.
  • (v. t.) To hide the head, as a child in the mother's bosom

    Nyctalopia
  • (n.) A disease of the eye, in consequence of which the patient can see well in a faint light or at twilight, but is unable to see during the day or in a strong light

    Nyctitropism
  • (n.) The tendency of certain plant organs, as leaves, to assume special "sleeping" positions or make curvatures under the influence of darkness

    Nymph
  • (n.) A goddess of the mountains, forests, meadows, or waters.

    Nystagmus
  • (n.) A rapid involuntary oscillation of the eyeballs.

    O
  • (a.) One.
  • (interj.) An exclamation used in calling or directly addressing a person or personified object
  • (n.) A cipher

    Oaf
  • (n.) Originally, an elf's child

    Oafish
  • (a.) Like an oaf

    Oak
  • (n.) Any tree or shrub of the genus Quercus. The oaks have alternate leaves, often variously lobed, and staminate flowers in catkins

    Oaken
  • (a.) Made or consisting of oaks or of the wood of oaks.

    Oakum
  • (n.) The coarse portion separated from flax or hemp in nackling.

    Oar
  • (n) An implement for impelling a boat, being a slender piece of timber, usually ash or spruce, with a grip or handle at one end and a broad blade at the other
  • (v. t. & i.) To row.

    Oarfish
  • (n.) The ribbon fish.

    Oarlock
  • (n.) The notch, fork, or other device on the gunwale of a boat, in which the oar rests in rowing

    Oarsman
  • (n.) One who uses, or is skilled in the use of, an oar

    Oasis
  • (n.) A fertile or green spot in a waste or desert, esp. in a sandy desert.

    Oast
  • (n.) A kiln to dry hops or malt

    Oat
  • (n.) A musical pipe made of oat straw.

    Oatcake
  • (n.) A cake made of oatmeal.

    Oaten
  • (a.) Consisting of an oat straw or stem

    Oath
  • (n.) A careless and blasphemous use of the name of the divine Being, or anything divine or sacred, by way of appeal or as a profane exclamation or ejaculation

    Oatmeal
  • (n.) A plant of the genus Panicum

    Obcompressed
  • (a.) Compressed or flattened antero-posteriorly, or in a way opposite to the usual one.

    Obcordate
  • (a.) Heart-shaped, with the attachment at the pointed end

    Obduracy
  • (n.) The duality or state of being obdurate

    Obdurate
  • (a.) Hard
  • (v. t.) To harden.

    Obeah
  • (a.) Of or pertaining to obi

    Obedience
  • (n.) A cell (or offshoot of a larger monastery) governed by a prior.

    Obedient
  • (a.) Subject in will or act to authority

    Obeisance
  • (n.) A manifestation of obedience

    Obelisk
  • (n.) A mark of reference
  • (v. t.) To mark or designate with an obelisk.

    Obelize
  • (v. t.) To designate with an obelus

    Obelus
  • (n.) A mark

    Oberon
  • (n.) The king of the fairies, and husband of Titania or Queen Mab.

    Obese
  • (a.) Excessively corpulent

    Obesity
  • (n.) The state or quality of being obese

    Obey
  • (v. i.) To give obedience.
  • (v. t.) To give ear to

    Obfuscate
  • (a.) Obfuscated
  • (v. t.) To darken

    Obi
  • (n.) A charm or fetich.

    Obit
  • (n.) A funeral solemnity or office

    Object
  • (a.) Opposed
  • (v. i.) To make opposition in words or argument
  • (v. t.) A word, phrase, or clause toward which an action is directed, or is considered to be directed

    Objurgate
  • (v. t.) To chide

    Objurgatory
  • (a.) Designed to objurgate or chide

    Oblate
  • (a.) Flattened or depressed at the poles

    Oblation
  • (n.) A gift or contribution made to a church, as for the expenses of the eucharist, or for the support of the clergy and the poor

    Obligate
  • (v. t.) To bind or firmly hold to an act

    Obligation
  • (n.) A bond with a condition annexed, and a penalty for nonfulfillment. In a larger sense, it is an acknowledgment of a duty to pay a certain sum or do a certain things

    Obligatory
  • (a.) Binding in law or conscience

    Oblige
  • (v. t.) To attach, as by a bond.

    Obliging
  • (a.) Putting under obligation

    Obligor
  • (n.) The person who binds himself, or gives his bond to another.

    Oblique
  • (a.) Not direct in descent
  • (n.) An oblique line.
  • (v. i.) To deviate from a perpendicular line

    Obliquity
  • (n.) Deviation from ordinary rules

    Obliterate
  • (a.) Scarcely distinct
  • (v. t.) To erase or blot out

    Oblivion
  • (n.) Official ignoring of offenses

    Oblivious
  • (a.) Evincing oblivion

    Oblong
  • (a.) Having greater length than breadth, esp. when rectangular.
  • (n.) A rectangular figure longer than it is broad

    Obloquy
  • (n.) Cause of reproach

    Obnoxious
  • (a.) Liable to censure

    Oboe
  • (n.) One of the higher wind instruments in the modern orchestra, yet of great antiquity, having a penetrating pastoral quality of tone, somewhat like the clarinet in form, but more slender, and sounded by means of a double reed

    Obovate
  • (a.) Inversely ovate

    Obscene
  • (a/) Foul

    Obscenity
  • (n.) That quality in words or things which presents what is offensive to chasity or purity of mind

    Obscurant
  • (n.) One who obscures

    Obscure
  • (a.) To render obscure
  • (n.) Obscurity.
  • (superl.) Covered over, shaded, or darkened
  • (v. i.) To conceal one's self

    Obscurity
  • (n.) The quality or state of being obscure

    Obsecrate
  • (v. t.) To beseech

    Obsequent
  • (a.) Obedient

    Obsequious
  • (a.) Of or pertaining to obsequies

    Observable
  • (a.) Worthy or capable of being observed

    Observance
  • (n.) An act, ceremony, or rite, as of worship or respect

    Observant
  • (a.) Submissively attentive
  • (n.) An Observantine.

    Observation
  • (n.) Hence: An expression of an opinion or judgment upon what one has observed

    Observatory
  • (n.) A building fitted with instruments for making systematic observations of any particular class or series of natural phenomena

    Observe
  • (v. i.) To make a remark
  • (v. t.) To be on the watch respecting

    Obsess
  • (v. t.) To besiege

    Obsidian
  • (n.) A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters

    Obsolesce
  • (v. i.) To become obsolescent.

    Obsolete
  • (a.) No longer in use
  • (v. i.) To become obsolete

    Obstacle
  • (v.) That which stands in the way, or opposes

    Obstetrician
  • (n.) One skilled in obstetrics

    Obstetrics
  • (n.) The science of midwifery

    Obstinacy
  • (n.) A fixedness in will, opinion, or resolution that can not be shaken at all, or only with great difficulty

    Obstinate
  • (a.) Not yielding

    Obstipation
  • (n.) Extreme constipation.

    Obstreperous
  • (a.) Attended by, or making, a loud and tumultuous noise

    Obstruct
  • (v. t.) To be, or come, in the way of

    Obstruent
  • (a.) Causing obstruction
  • (n.) Anything that obstructs or closes a passage

    Obtain
  • (v. i.) To become held
  • (v. t.) To get hold of by effort

    Obtrude
  • (v. i.) To thrust one's self upon a company or upon attention
  • (v. t.) To offer with unreasonable importunity

    Obtrusive
  • (a.) Disposed to obtrude

    Obtund
  • (v. t.) To reduce the edge, pungency, or violent action of

    Obtuse
  • (superl.) Dull

    Obverse
  • (a.) Anything necessarily involved in, or answering to, another

    Obversion
  • (n.) The act of immediate inference, by which we deny the opposite of anything which has been affirmed

    Obvert
  • (v. t.) To turn toward.

    Obviate
  • (v. t.) To anticipate

    Obvious
  • (a.) Easily discovered, seen, or understood

    Oca
  • (n.) A Peruvian name for certain species of Oxalis (O. crenata, and O. tuberosa) which bear edible tubers

    Ocarina
  • (n.) A kind of small simple wind instrument.

    Occasion
  • (n.) A falling out, happening, or coming to pass
  • (v. t.) To give occasion to

    Occident
  • (n.) The part of the horizon where the sun last appears in the evening

    Occipital
  • (a.) Of or pertaining to the occiput, or back part of the head, or to the occipital bone.
  • (n.) The occipital bone.

    Occiput
  • (n.) A plate which forms the back part of the head of insects.

    Occlude
  • (v. t.) To shut up

    Occlusion
  • (n.) The act of occluding, or the state of being occluded.

    Occult
  • (a.) Hidden from the eye or the understanding
  • (v. t.) To eclipse

    Occupancy
  • (n.) The act of taking or holding possession

    Occupant
  • (n.) A prostitute.

    Occupation
  • (n.) That which occupies or engages the time and attention

    Occupy
  • (v. i.) To follow business
  • (v. t.) To do business in

    Occur
  • (v. i.) To go in order to meet

    Ocean
  • (a.) Of or pertaining to the main or great sea
  • (n.) An immense expanse

    Ocellus
  • (n.) A little eye

    Ocelot
  • (n.) An American feline carnivore (Felis pardalis). It ranges from the Southwestern United States to Patagonia

    Ochlocracy
  • (n.) A form of government by the multitude

    Ochre
  • (n.) A impure earthy ore of iron or a ferruginous clay, usually red (hematite) or yellow (limonite)

    Octad
  • (n.) An atom or radical which has a valence of eight, or is octavalent.

    Octagon
  • (n.) Any structure (as a fortification) or place with eight sides or angles.

    Octahedral
  • (a.) Having eight faces or sides

    Octahedron
  • (n.) A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles

    Octameter
  • (n.) A verse containing eight feet

    Octane
  • (n.) Any one of a group of metametric hydrocarcons (C8H18) of the methane series. The most important is a colorless, volatile, inflammable liquid, found in petroleum, and a constituent of benzene or ligroin

    Octant
  • (n.) An instrument for measuring angles (generally called a quadrant), having an arc which measures up to 9O¡, but being itself the eighth part of a circle

    Octavalent
  • (a.) Having a valence of eight

    Octave
  • (a.) Consisting of eight
  • (n.) A small cask of wine, the eighth part of a pipe.

    Octavo
  • (a.) Having eight leaves to a sheet
  • (n.) A book composed of sheets each of which is folded into eight leaves

    Octet
  • (n.) A composition for eight parts, usually for eight solo instruments or voices.

    October
  • (n.) Ale or cider made in that month.

    Octodecimo
  • (a.) Having eighteen leaves to a sheet
  • (n.) A book composed of sheets each of which is folded into eighteen leaves

    Octogenarian
  • (n.) A person eighty years, or more, of age.

    Octonary
  • (a.) Of or pertaining to the number eight.

    Octopod
  • (n.) One of the Octocerata.

    Octopus
  • (n.) A genus of eight-armed cephalopods, including numerous species, some of them of large size

    Octosyllable
  • (a.) Octosyllabic.
  • (n.) A word of eight syllables.

    Octuple
  • (a.) Eightfold.

    Ocular
  • (a.) Depending on, or perceived by, the eye
  • (n.) The eyepiece of an optical instrument, as of a telescope or microscope.

    Oculist
  • (n.) One skilled in treating diseases of the eye.

    Oculomotor
  • (a.) Of or pertaining to the movement of the eye
  • (n.) The oculomotor nerve.

    Od
  • (n.) An alleged force or natural power, supposed, by Reichenbach and others, to produce the phenomena of mesmerism, and to be developed by various agencies, as by magnets, heat, light, chemical or vital action, etc

    Odalisque
  • (n.) A female slave or concubine in the harem of the Turkish sultan.

    Odd
  • (superl.) Different from what is usual or common

    Oddity
  • (n.) That which is odd

    Oddment
  • (n.) An odd thing, or one that is left over, disconnected, fragmentary, or the like

    Odds
  • (a.) Difference in favor of one and against another

    Ode
  • (n.) A short poetical composition proper to be set to music or sung

    Odious
  • (a.) Causing or provoking hatred, repugnance, or disgust

    Odium
  • (n.) Hatred

    Odometer
  • (n.) An instrument attached to a vehicle, to measure the distance traversed

    Odontalgia
  • (n.) Toothache.

    Odontoblast
  • (n.) One of the cells which secrete the chitinous teeth of Mollusca.

    Odontoid
  • (a.) Having the form of a tooth

    Odontology
  • (n.) The science which treats of the teeth, their structure and development.

    Odor
  • (n.) Any smell, whether fragrant or offensive

    Odyssey
  • (n.) An epic poem attributed to Homer, which describes the return of Ulysses to Ithaca after the siege of Troy

    Oedema
  • (n.) A swelling from effusion of watery fluid in the cellular tissue beneath the skin or mucous membrance

    Oenology
  • (n.) Knowledge of wine, scientific or practical.

    Oenomel
  • (n.) Wine mixed with honey

    Oersted
  • (n.) The C.G.S. unit of magnetic reluctance or resistance, equal to the reluctance of a centimeter cube of air (or vacuum) between parallel faces

    Oestrus
  • (n.) A genus of gadflies. The species which deposits its larvae in the nasal cavities of sheep is oestrus ovis

    Of
  • (prep.) Denoting identity or equivalence

    Off
  • (a.) Designating a time when one is not strictly attentive to business or affairs, or is absent from his post, and, hence, a time when affairs are not urgent
  • (adv.) Denoting a different direction
  • (interj.) Away
  • (n.) The side of the field that is on the right of the wicket keeper.
  • (prep.) Not on

    Offal
  • (n.) A dead body

    Offcut
  • (n.) A portion ofthe printed sheet, in certain sizes of books, that is cut off before folding.

    Offence
  • (n.) A cause or occasion of stumbling or of sin.

    Offend
  • (v. t.) To be offensive to

    Offensive
  • (a.) Giving offense
  • (n.) The state or posture of one who offends or makes attack

    Offer
  • (v. i.) To make an attempt
  • (v. t.) Attempt

    Offhand
  • (a.) Instant
  • (adv.) In an offhand manner

    Office
  • (n.) A charge or trust, of a sacred nature, conferred by God himself
  • (v. t.) To perform, as the duties of an office

    Official
  • (a.) An ecclesiastical judge appointed by a bishop, chapter, archdeacon, etc., with charge of the spiritual jurisdiction
  • (n.) Approved by authority

    Officiant
  • (n.) The officer who officiates or performs an office, as the burial office.

    Officiary
  • (a.) Of or pertaining to an office or an officer

    Officiate
  • (v. i.) To act as an officer in performing a duty
  • (v. t.) To discharge, perform, or supply, as an official duty or function.

    Officinal
  • (a.) Kept in stock by apothecaries

    Officious
  • (a.) Disposed to serve

    Offing
  • (n.) That part of the sea at a good distance from the shore, or where there is deep water and no need of a pilot

    Offish
  • (a.) Shy or distant in manner.

    Offprint
  • (n.) A reprint or excerpt.
  • (v. t.) To reprint (as an excerpt)

    Offset
  • (imp. & p. p.) of Offset
  • (n.) A horizontal ledge on the face of a wall, formed by a diminution of its thickness, or by the weathering or upper surface of a part built out from it
  • (v. i.) To make an offset.
  • (v. t.) To form an offset in, as in a wall, rod, pipe, etc.

    Offshoot
  • (n.) That which shoots off or separates from a main stem, channel, family, race, etc.

    Offshore
  • (a.) From the shore

    Offspring
  • (n.sing. & pl.) Origin

    Oft
  • (a.) Frequent
  • (adv.) Often

    Often
  • (a.) Frequent
  • (adv.) Frequently

    Ogee
  • (n.) A molding, the section of which is the form of the letter S, with the convex part above

    Ogham
  • (n.) A particular kind of writing practiced by the ancient Irish, and found in inscriptions on stones, metals, etc

    Ogive
  • (n.) The arch or rib which crosses a Gothic vault diagonally.

    Ogle
  • (n.) An amorous side glance or look.
  • (v. t.) To view or look at with side glances, as in fondness, or with a design to attract notice.

    Ogre
  • (n.) An imaginary monster, or hideous giant of fairy tales, who lived on human beings

    Oh
  • (interj.) An exclamation expressing various emotions, according to the tone and manner, especially surprise, pain, sorrow, anxiety, or a wish

    Ohm
  • (n.) The standard unit in the measure of electrical resistance, being the resistance of a circuit in which a potential difference of one volt produces a current of one ampere

    Ohmmeter
  • (n.) An instrument for indicating directly resistance in ohms.

    Oho
  • (interj.) An exclamation of surprise, etc.

    Oidium
  • (n.) A genus of minute fungi which form a floccose mass of filaments on decaying fruit, etc. Many forms once referred to this genus are now believed to be temporary conditions of fungi of other genera, among them the vine mildew (Oidium Tuckeri), which has caused much injury to grapes

    Oil
  • (n.) Any one of a great variety of unctuous combustible substances, not miscible with water
  • (v. t.) To smear or rub over with oil

    Oilcloth
  • (n.) Cloth treated with oil or paint, and used for marking garments, covering floors, etc.

    Oiled
  • (a.) Covered or treated with oil

    Oiler
  • (n.) One who, or that which, oils.

    Oilman
  • (n.) One who deals in oils

    Oilskin
  • (n.) Cloth made waterproof by oil.

    Oilstone
  • (n.) A variety of hone slate, or whetstone, used for whetting tools when lubricated with oil.

    Oily
  • (superl.) Consisting of oil

    Ointment
  • (n.) That which serves to anoint

    Okapi
  • (n.) A peculiar mammal (Okapia johnostoni) closely related to the giraffe, discovered in the deep forests of Belgian Kongo in 1900

    Okra
  • (n.) An annual plant (Abelmoschus, / Hibiscus, esculentus), whose green pods, abounding in nutritious mucilage, are much used for soups, stews, or pickles

    Olden
  • (a.) Old
  • (v. i.) To grow old

    Olea
  • (n.) A genus of trees including the olive.

    Olecranon
  • (n.) The large process at the proximal end of the ulna which projects behind the articulation with the humerus and forms the bony prominence of the elbow

    Oleic
  • (a.) Pertaining to, derived from, or contained in, oil

    Olein
  • (n.) A fat, liquid at ordinary temperatures, but solidifying at temperatures below 0¡ C., found abundantly in both the animal and vegetable kingdoms (see Palmitin)

    Oleograph
  • (n.) A picture produced in oils by a process analogous to that of lithographic printing.

    Oleomargarine
  • (n.) A liquid oil made from animal fats (esp. beef fat) by separating the greater portion of the solid fat or stearin, by crystallization

    Oleoresin
  • (n.) A liquid or semiliquid preparation extracted (as from capsicum, cubebs, or ginger) by means of ether, and consisting of fixed or volatile oil holding resin in solution

    Olfaction
  • (n.) The sense by which the impressions made on the olfactory organs by the odorous particles in the atmosphere are perceived

    Olfactory
  • (a.) Of, pertaining to, or connected with, the sense of smell
  • (n.) An olfactory organ

    Olibanum
  • (n.) The fragrant gum resin of various species of Boswellia

    Oligarch
  • (n.) A member of an oligarchy

    Oligocene
  • (a.) Of, pertaining to, or designating, certain strata which occupy an intermediate position between the Eocene and Miocene periods
  • (n.) The Oligocene period.

    Oligoclase
  • (n.) A triclinic soda-lime feldspar.

    Olio
  • (n.) A collection of miscellaneous pieces.

    Olive
  • (a.) Approaching the color of the olive
  • (n.) An olivary body.

    Olivine
  • (n.) A common name of the yellowish green mineral chrysolite, esp. the variety found in eruptive rocks

    Olla
  • (n.) A dish of stewed meat

    Ology
  • (n.) A colloquial or humorous name for any science or branch of knowledge.

    Olympiad
  • (n.) A period of four years, by which the ancient Greeks reckoned time, being the interval from one celebration of the Olympic games to another, beginning with the victory of Cor/bus in the foot race, which took place in the year 776 b

    Olympic
  • (a.) Of or pertaining to Olympus, a mountain of Thessaly, fabled as the seat of the gods, or to Olympia, a small plain in Elis

    Om
  • (interj. & n.) A mystic syllable or ejaculation used by Hindus and Buddhists in religious rites

    Omasum
  • (n.) The third division of the stomach of ruminants.

    Ombre
  • (n.) A game at cards, borrowed from the Spaniards, and usually played by three persons.

    Omega
  • (n.) The last

    Omelet
  • (n.) Eggs beaten up with a little flour, etc., and cooked in a frying pan

    Omen
  • (n.) An occurrence supposed to portend, or show the character of, some future event
  • (v. t.) To divine or to foreshow by signs or portents

    Omer
  • (n.) A Hebrew measure, the tenth of an ephah.

    Omicron
  • (n.) Lit., the little, or short, O, o

    Ominous
  • (a.) Of or pertaining to an omen or to omens

    Omissible
  • (a.) Capable of being omitted

    Omission
  • (n.) That which is omitted or is left undone.

    Omit
  • (v. t.) To let go

    Omnibus
  • (n.) A long four-wheeled carriage, having seats for many people

    Omnipotent
  • (a.) Able in every respect and for every work

    Omnipresent
  • (a.) Present in all places at the same time

    Omniscience
  • (n.) The quality or state of being omniscient

    Omniscient
  • (a.) Having universal knowledge

    Omnivorous
  • (a.) All-devouring

    Omphalos
  • (n.) The navel.

    On
  • (prep.) Adhering

    Onager
  • (n.) A military engine acting like a sling, which threw stones from a bag or wooden bucket, and was operated by machinery

    Onanism
  • (n.) Self-pollution

    Once
  • (adv.) At any one time

    One
  • (a.) Being a single unit, or entire being or thing, and no more
  • (indef. pron.) Any person, indefinitely
  • (n.) A single person or thing.
  • (v. t.) To cause to become one

    Oneiromancy
  • (n.) Divination by means of dreams.

    Oneness
  • (n.) The state of being one

    Onerous
  • (a.) Burdensome

    Oneself
  • (pron.) A reflexive form of the indefinite pronoun one. Commonly writen as two words, one's self

    Ongoing
  • (n.) The act of going forward

    Onion
  • (n.) A liliaceous plant of the genus Allium (A. cepa), having a strong-flavored bulb and long hollow leaves

    Only
  • (a.) Above all others
  • (conj.) Save or except (that)

    Onomastic
  • (a.) Applied to a signature when the body of the instrument is in another's handwriting.

    Onomatopoeia
  • (n.) The formation of words in imitation of sounds

    Onomatopoeic
  • (a.) Onomatopoetic.

    Onrush
  • (n.) A rushing onward.

    Onset
  • (n.) Anything set on, or added, as an ornament or as a useful appendage.
  • (v. t.) To assault

    Onslaught
  • (n.) A bloody fray or battle.

    Onto
  • (prep.) On the top of

    Onus
  • (n.) A burden

    Onward
  • (a.) Advanced in a forward direction or toward an end.
  • (adv.) Toward a point before or in front

    Onyx
  • (n.) Chalcedony in parallel layers of different shades of color. It is used for making cameos, the figure being cut in one layer with the next as a ground

    Oogenesis
  • (n.) The development, or mode of origin, of the ova.

    Oogonium
  • (n.) A special cell in certain cryptogamous plants containing oospheres, as in the rockweeds (Fucus), and the orders Vaucherieae and Peronosporeae

    Oolite
  • (n.) A variety of limestone, consisting of small round grains, resembling the roe of a fish. It sometimes constitutes extensive beds, as in the European Jurassic

    Oolong
  • (n.) A fragrant variety of black tea having somewhat the flavor of green tea.

    Oop
  • (v. t.) To bind with a thread or cord

    Oophorectomy
  • (n.) Ovariotomy.

    Oophoritis
  • (n.) Ovaritis.

    Oospore
  • (n.) A fertilized oosphere in the ovule of a flowering plant.

    Ooze
  • (n.) A soft deposit covering large areas of the ocean bottom, composed largely or mainly of the shells or other hard parts of minute organisms, as Foraminifera, Radiolaria, and diatoms
  • (v. t.) To cause to ooze.

    Oozy
  • (a.) Miry

    Opacity
  • (n.) Obscurity

    Opah
  • (n.) A large oceanic fish (Lampris quttatus), inhabiting the Atlantic Ocean. It is remarkable for its brilliant colors, which are red, green, and blue, with tints of purple and gold, covered with round silvery spots

    Opal
  • (n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity

    Opaque
  • (a.) Impervious to the rays of light
  • (n.) That which is opaque

    Ope
  • (a.) Open.
  • (v. t. & i.) To open.

    Open
  • (a.) Free
  • (n.) Open or unobstructed space
  • (v. i.) To bark on scent or view of the game.
  • (v. t.) To disclose

    Opera
  • (n.) A drama, either tragic or comic, of which music forms an essential part

    Operculum
  • (n.) Any lidlike or operculiform process or part

    Operetta
  • (n.) A short, light, musical drama.

    Operose
  • (a.) Wrought with labor

    Ophicleide
  • (n.) A large brass wind instrument, formerly used in the orchestra and in military bands, having a loud tone, deep pitch, and a compass of three octaves

    Ophidian
  • (a.) Of or pertaining to the Ophidia
  • (n.) One of the Ophidia

    Ophiology
  • (n.) That part of natural history which treats of the ophidians, or serpents.

    Ophite
  • (a.) A mamber of a Gnostic serpent-worshiping sect of the second century.
  • (n.) A greenish spotted porphyry, being a diabase whose pyroxene has been altered to uralite

    Ophiuchus
  • (n.) A constellation in the Northern Hemisphere, delineated as a man holding a serpent in his hands

    Ophthalmia
  • (n.) An inflammation of the membranes or coats of the eye or of the eyeball.

    Ophthalmic
  • (a.) Of, pertaining to, or in the region of, the eye

    Ophthalmologist
  • (n.) One skilled in ophthalmology

    Ophthalmology
  • (n.) The science which treats of the structure, functions, and diseases of the eye.

    Ophthalmoscope
  • (n.) An instrument for viewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens

    Ophthalmoscopy
  • (n.) A branch of physiognomy which deduces the knowledge of a person's temper and character from the appearance of the eyes

    Opiate
  • (a.) Inducing sleep
  • (n.) Any medicine that contains opium, and has the quality of inducing sleep or repose
  • (v. t.) To subject to the influence of an opiate

    Opine
  • (v. t. & i.) To have an opinion

    Opinion
  • (n.) Favorable estimation
  • (v. t.) To opine.

    Opium
  • (n.) The inspissated juice of the Papaver somniferum, or white poppy.


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