| onanist | (noun) a person who practices masturbation | Synonyms: masturbator |
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| once | (adverb) on one occasion | Synonyms: in one case, one time |
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| (adverb) at a previous time | Synonyms: at one time, erst, erstwhile, formerly |
| (adverb) as soon as | - |
| onchocerciasis | (noun) infestation with slender threadlike roundworms (filaria) deposited under the skin by the bite of black fleas; when the eyes are involved it can result in blindness; common in Africa and tropical America | Synonyms: river blindness |
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| oncidium | (noun) any orchid of the genus Oncidium: characterized by slender branching sprays of small yellow and brown flowers; often grown as houseplants | Synonyms: butterfly orchid, butterfly plant, dancing lady orchid |
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| oncogene | (noun) a gene that disposes normal cells to change into cancerous tumor cells | Synonyms: transforming gene |
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| oncologic | (adjective) of or relating to or practicing oncology | Synonyms: oncological |
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| oncological | (adjective) of or relating to or practicing oncology | Synonyms: oncologic |
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| oncologist | (noun) a specialist in oncology | - |
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| oncology | (noun) the branch of medicine concerned with the study and treatment of tumors | - |
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| oncoming | (adjective) moving toward one | - |
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| (noun) the beginning or early stages | Synonyms: onset |
| one | (adjective) used of a single unit or thing; not two or more | Synonyms: 1, ane, i |
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| (adjective) being a single entity made by combining separate components | - |
| (adjective) (informal) very; used informally as an intensifier | Synonyms: right |
| (adjective) eminent beyond or above comparison | Synonyms: matchless, nonpareil, one and only, peerless, unmatchable, unmatched, unrivaled, unrivalled |
| (adjective) indefinite in time or position | - |
| (adjective) of the same kind or quality | - |
| (adjective) having the indivisible character of a unit | Synonyms: unitary |
| (noun) a single person or thing | - |
| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, ace, I, single, unity |
| oneiric | (adjective) of or relating to or suggestive of dreams | - |
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| oneirism | (noun) absentminded dreaming while awake | Synonyms: air castle, castle in Spain, castle in the air, daydream, daydreaming, reverie, revery |
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| oneiromancer | (noun) someone who divines through the interpretation of dreams | - |
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| oneiromancy | (noun) divination through the interpretation of dreams | - |
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| oneness | (noun) the quality of being united into one | Synonyms: unity |
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| onerous | (adjective) not easily borne; wearing | Synonyms: burdensome, taxing |
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| onerously | (adverb) in an onerous manner | - |
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| onerousness | (noun) unwelcome burdensome difficulty | Synonyms: burdensomeness, heaviness, oppressiveness |
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| onetime | (adjective) belonging to some prior time | Synonyms: erstwhile, former, old, one-time, quondam, sometime |
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| ongoing | (adjective) currently happening | Synonyms: on-going |
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| onion | (noun) an aromatic flavorful vegetable | - |
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| (noun) bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb | Synonyms: Allium cepa, onion plant |
| (noun) the bulb of an onion plant | - |
| onionskin | (noun) a thin strong lightweight translucent paper used especially for making carbon copies | Synonyms: flimsy |
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| onkos | (noun) A high ornate headdress worn by the performers of Greek tragedy. | - |
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| online | (adjective) connected to a computer network or accessible by computer | Synonyms: on-line |
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| (adjective) on a regular route of a railroad or bus or airline system | Synonyms: on-line |
| (adjective) being in progress now | Synonyms: on-line |
| onlooker | (noun) someone who looks on | Synonyms: looker-on |
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| only | (adjective) exclusive of anyone or anything else | Synonyms: alone |
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| (adjective) being the only one; single and isolated from others | Synonyms: lone, lonesome, sole, solitary |
| (adverb) with nevertheless the final result | - |
| (adverb) without any others being included or involved | Synonyms: alone, entirely, exclusively, solely |
| (adverb) and nothing more | Synonyms: but, just, merely, simply |
| (adverb) never except when | Synonyms: only if, only when |
| (adverb) in the final outcome | - |
| (adverb) as recently as | - |
| (adverb) except that | - |
| onomancer | (noun) one who practices onomancy | - |
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| onomancy | (noun) divination by the letters of a name | - |
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| onomastic | (adjective) of or related to onomastics | - |
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| onomasticon | (noun) a list of proper nouns naming persons or places | - |
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| onomastics | (noun) the branch of lexicology that studies the forms and origins of proper names | - |
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| onomatomania | (noun) obsession with a particular word which the person uses repeatedly or which intrudes into consciousness | - |
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| onomatopoeia | (noun) using words that imitate the sound they denote | - |
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| onomatopoeic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeical, onomatopoetic |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoetic |
| onomatopoeical | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoetic |
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| onomatopoetic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoeical |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoeic |
| onrush | (noun) (military) an offensive against an enemy (using weapons) | Synonyms: attack, onset, onslaught |
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| (noun) a forceful forward rush or flow | - |
| onset | (noun) (military) an offensive against an enemy (using weapons) | Synonyms: attack, onrush, onslaught |
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| (noun) the beginning or early stages | Synonyms: oncoming |
| onshore | (adjective) (of winds) coming from the sea toward the land | Synonyms: inshore, shoreward |
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| (adjective) on the edge of the land | - |
| (adverb) on or toward the land | - |
| onside | (adjective) not offside; being within the prescribed area of play | - |
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| onslaught | (noun) (military) an offensive against an enemy (using weapons) | Synonyms: attack, onrush, onset |
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| (noun) the rapid and continuous delivery of linguistic communication (spoken or written) | Synonyms: barrage, bombardment, outpouring |
| (noun) a sudden and severe onset of trouble | - |
| onstage | (adjective) situated or taking place on the area of a stage visible to the audience | - |
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| (adverb) on the stage | - |
| ontogenesis | (noun) (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level | Synonyms: development, growing, growth, maturation, ontogeny |
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| ontogenetic | (adjective) of or relating to the origin and development of individual organisms | - |
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| ontogeny | (noun) (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level | Synonyms: development, growing, growth, maturation, ontogenesis |
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| ontological | (adjective) of or relating to ontology | - |
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| ontology | (noun) the metaphysical study of the nature of being and existence | - |
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| (noun) (computer science) a rigorous and exhaustive organization of some knowledge domain that is usually hierarchical and contains all the relevant entities and their relations | - |
| onus | (noun) an onerous or difficult concern | Synonyms: burden, encumbrance, incumbrance, load |
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| onward | (adverb) forward in time or order or degree | Synonyms: forth, forward |
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| (adverb) in a forward direction | Synonyms: ahead, forrader, forward, forwards, onwards |
| onwards | (adverb) in a forward direction | Synonyms: ahead, forrader, forward, forwards, onward |
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| onycholysis | (noun) separation of a nail from its normal attachment to the nail bed | - |
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| onychophoran | (noun) any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms | Synonyms: peripatus, velvet worm |
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| onychosis | (noun) any disease or disorder of the nails | - |
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| onymous | (adjective) bearing a name | - |
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| onyx | (noun) a chalcedony with alternating black and white bands; used in making cameos | - |
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| onyxis | (noun) toenail having its free tip or edges embedded in the surrounding flesh | Synonyms: ingrown toenail |
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| oocyte | (noun) a female gametocyte that develops into an ovum after two meiotic divisions | - |
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| oodles | (noun) a large number or amount | Synonyms: dozens, gobs, heaps, lashings, loads, lots, piles, rafts, scads, scores, slews, stacks, tons, wads |
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| oogenesis | (noun) development of ova | - |
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| ooh | (verb) express admiration and pleasure by uttering `ooh' or `aah' | Synonyms: aah |
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| oology | (noun) the branch of zoology that studies eggs (especially birds' eggs and their size, shape, coloration, and number) | - |
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| oolong | (noun) Chinese tea leaves that have been partially fermented before being dried | - |
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| oomph | (noun) the activeness of an energetic personality | Synonyms: dynamism, pizzaz, pizzazz, zing |
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| (noun) attractiveness to the opposite sex | Synonyms: desirability, desirableness, sex appeal |
| oophorectomy | (noun) surgical removal of one or both ovaries | Synonyms: ovariectomy |
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| oophoritis | (noun) inflammation of one or both ovaries | - |
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| oophorosalpingectomy | (noun) surgical removal of one or both ovaries and the corresponding Fallopian tubes | - |
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| oosphere | (noun) a gamete; used especially of lower plants | - |
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| oospore | (noun) a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi | - |
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| ootid | (noun) mature ovum after penetration by sperm but before the formation of a zygote | - |
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| ooze | (noun) the process of seeping | Synonyms: oozing, seepage |
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| (noun) any thick, viscous matter | Synonyms: goo, gook, goop, guck, gunk, muck, slime, sludge |
| (verb) release (a liquid) in drops or small quantities | Synonyms: exudate, exude, ooze out, transude |
| (verb) pass gradually or leak through or as if through small openings | Synonyms: seep |
| oozing | (adjective) leaking out slowly | Synonyms: oozy, seeping |
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| (noun) the process of seeping | Synonyms: ooze, seepage |
| oozy | (adjective) leaking out slowly | Synonyms: oozing, seeping |
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| opacification | (noun) the process of becoming cloudy or opaque | - |
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| opacify | (verb) become opaque | - |
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| (verb) make opaque | - |
| opacity | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opaqueness |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opaqueness |
| (noun) the phenomenon of not permitting the passage of electromagnetic radiation | - |
| opah | (noun) large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean | Synonyms: Lampris regius, moonfish |
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| opal | (noun) a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones | - |
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| opalesce | (verb) exhibit a play of colors like that of an opal | - |
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| (verb) reflect light or colors like an opal | - |
| opalescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: iridescence |
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| opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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| opaline | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, pearlescent |
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| opalise | (verb) replace or convert into opal | Synonyms: opalize |
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| (verb) make opalescent | Synonyms: opalize |
| opalize | (verb) replace or convert into opal | Synonyms: opalise |
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| (verb) make opalescent | Synonyms: opalise |
| opaque | (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight | - |
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| (adjective) hard or impossible to understand | Synonyms: unintelligible |
| opaquely | (adverb) in an opaque manner | - |
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| opaqueness | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opacity |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opacity |
| open | (adjective) ready or willing to receive favorably | Synonyms: receptive |
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| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: unfastened |
| (adjective) affording free passage or access | - |
| (adjective) (set theory) of an interval that contains neither of its endpoints | - |
| (adjective) open and observable; not secret or hidden | Synonyms: overt |
| (adjective) used of mouth or eyes | Synonyms: opened |
| (adjective) ready for business | - |
| (adjective) not having been filled | - |
| (adjective) (of textures) full of small openings or gaps | Synonyms: loose |
| (adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: candid, heart-to-heart |
| (adjective) not requiring union membership | - |
| (adjective) open to or in view of all | - |
| (adjective) possibly accepting or permitting | Synonyms: capable, subject |
| (adjective) without undue constriction as from e.g. tenseness or inhibition | - |
| (adjective) having no protecting cover or enclosure | - |
| (adjective) affording free passage or view | Synonyms: clear |
| (adjective) with no protection or shield | Synonyms: exposed |
| (adjective) accessible to all | - |
| (adjective) not sealed or having been unsealed | Synonyms: opened |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: undecided, undetermined, unresolved |
| (adjective) not defended or capable of being defended | Synonyms: assailable, undefendable, undefended |
| (noun) information that has become public | Synonyms: surface |
| (noun) a tournament in which both professionals and amateurs may play | - |
| (noun) a clear or unobstructed space or expanse of land or water | Synonyms: clear |
| (noun) where the air is unconfined | Synonyms: open air, out-of-doors, outdoors |
| (verb) make available | Synonyms: open up |
| (verb) become available | Synonyms: open up |
| (verb) make the opening move | - |
| (verb) cause to open or to become open | Synonyms: open up |
| (verb) become open | Synonyms: open up |
| (verb) spread out or open from a closed or folded state | Synonyms: spread, spread out, unfold |
| (verb) display the contents of a file or start an application as on a computer | - |
| (verb) afford access to | Synonyms: afford, give |
| (verb) start to operate or function or cause to start operating or functioning | Synonyms: open up |
| (verb) begin or set in action, of meetings, speeches, recitals, etc. | - |
| (verb) have an opening or passage or outlet | - |
| openbill | (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip | - |
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| opencast | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencut |
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| opencut | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencast |
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| opened | (adjective) used of mouth or eyes | Synonyms: open |
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| (adjective) made open or clear | - |
| (adjective) not sealed or having been unsealed | Synonyms: open |
| opener | (noun) a hand tool used for opening sealed containers (bottles or cans) | - |
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| (noun) the first event in a series | - |
| (noun) a person who unfastens or unwraps or opens | Synonyms: undoer, unfastener, untier |
| openhanded | (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal |
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| openhandedness | (noun) liberality in bestowing gifts; extremely liberal and generous of spirit | Synonyms: largess, largesse, magnanimity, munificence |
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| openhearted | (adjective) freely communicative; candidly straightforward | - |
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| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic |
| opening | (adjective) first or beginning | - |
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| (noun) a recognized sequence of moves at the beginning of a game of chess | Synonyms: chess opening |
| (noun) the act of opening something | - |
| (noun) becoming open or being made open | - |
| (noun) the first of a series of actions | Synonyms: first step, initiative, opening move |
| (noun) a vacant or unobstructed space that is man-made | - |
| (noun) an entrance equipped with a hatch; especially a passageway between decks of a ship | Synonyms: hatchway, scuttle |
| (noun) an aperture or hole that opens into a bodily cavity | Synonyms: orifice, porta |
| (noun) a possible alternative | Synonyms: possibility, possible action |
| (noun) the initial part of the introduction | - |
| (noun) the first performance (as of a theatrical production) | Synonyms: curtain raising, opening night |
| (noun) a ceremony accompanying the start of some enterprise | - |
| (noun) an open or empty space in or between things | Synonyms: gap |
| (noun) opportunity especially for employment or promotion | - |
| openly | (adverb) in an open way | - |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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| openness | (noun) characterized by an attitude of ready accessibility (especially about one's actions or purposes); without concealment; not secretive | Synonyms: nakedness |
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| (noun) willingness or readiness to receive (especially impressions or ideas) | Synonyms: receptiveness, receptivity |
| (noun) without obstructions to passage or view | - |