| okra | (noun) long mucilaginous green pods; may be simmered or sauteed but used especially in soups and stews | Synonyms: gumbo |
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| (noun) tall coarse annual of Old World tropics widely cultivated in southern United States and West Indies for its long mucilaginous green pods used as basis for soups and stews; sometimes placed in genus Hibiscus | Synonyms: Abelmoschus esculentus, gumbo, Hibiscus esculentus, lady's-finger, okra plant |
| (noun) long green edible beaked pods of the okra plant | - |
| ola | (noun) leaf or strip from a leaf of the talipot palm used in India for writing paper | Synonyms: olla |
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| old | (adjective) of long duration; not new | - |
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| (adjective) (used especially of persons) having lived for a relatively long time or attained a specific age | - |
| (adjective) skilled through long experience | Synonyms: older |
| (adjective) (used for emphasis) very familiar | - |
| (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, smashing, swell |
| (adjective) just preceding something else in time or order | Synonyms: previous |
| (adjective) belonging to some prior time | Synonyms: erstwhile, former, one-time, onetime, quondam, sometime |
| (noun) past times | - |
| olden | (adjective) relating to time long past | - |
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| older | (adjective) skilled through long experience | Synonyms: old |
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| (adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, senior |
| (adjective) used of the older of two persons of the same name especially used to distinguish a father from his son | Synonyms: elder, sr. |
| oldie | (noun) a song that was formerly popular | Synonyms: golden oldie |
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| oldish | (adjective) somewhat elderly | - |
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| oldline | (adjective) long-established | Synonyms: old-line |
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| (adjective) adhering to conservative or reactionary principles | Synonyms: old-line |
| oldness | (noun) the quality of being old; the opposite of newness | - |
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| (noun) the opposite of youngness | - |
| oldster | (noun) an elderly person | Synonyms: golden ager, old person, senior citizen |
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| oldtimer | (noun) an elderly man | Synonyms: antique, gaffer, old-timer, old geezer |
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| (noun) an experienced person who has been through many battles; someone who has given long service | Synonyms: old-timer, old hand, old stager, stager, veteran, warhorse |
| oldwench | (noun) tropical Atlantic fish | Synonyms: Balistes vetula, Bessy cerca, oldwife, queen triggerfish |
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| oldwife | (noun) tropical Atlantic fish | Synonyms: Balistes vetula, Bessy cerca, oldwench, queen triggerfish |
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| (noun) a common long-tailed sea duck of the northern parts of the United States | Synonyms: Clangula hyemalis, old squaw |
| oleaceous | (adjective) of or pertaining to or characteristic of trees or shrubs of the olive family | - |
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| oleaginous | (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oily, sebaceous |
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| (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, smarmy, soapy, unctuous |
| oleaginousness | (noun) consisting of or covered with oil | Synonyms: greasiness, oiliness |
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| (noun) smug self-serving earnestness | Synonyms: fulsomeness, oiliness, smarminess, unction, unctuousness |
| oleander | (noun) an ornamental but poisonous flowering shrub having narrow evergreen leaves and clusters of fragrant white to pink or red flowers: native to East Indies but widely cultivated in warm regions | Synonyms: Nerium oleander, rose bay |
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| oleaster | (noun) any of several shrubs of the genus Elaeagnus having silver-white twigs and yellow flowers followed by olivelike fruits | - |
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| olecranon | (noun) process of the ulna that forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended | Synonyms: olecranon process |
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| olefin | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: alkene, olefine |
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| olefine | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: alkene, olefin |
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| olein | (noun) a naturally occurring glyceride of oleic acid that is found in fats and oils | Synonyms: triolein |
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| oleo | (noun) a spread made chiefly from vegetable oils and used as a substitute for butter | Synonyms: margarin, margarine, marge, oleomargarine |
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| oleography | (noun) the art or process of producing chromolithographs printed on cloth to imitate an oil painting. | - |
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| oleomargarine | (noun) a spread made chiefly from vegetable oils and used as a substitute for butter | Synonyms: margarin, margarine, marge, oleo |
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| oleophilic | (adjective) having a strong affinity for oils rather than water | - |
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| oleophobic | (adjective) lacking affinity for oils | - |
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| oleoresin | (noun) a naturally occurring mixture of a resin and an essential oil; obtained from certain plants | - |
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| olfaction | (noun) the faculty that enables us to distinguish scents | Synonyms: olfactory modality, sense of smell, smell |
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| olfactive | (adjective) of or relating to olfaction | Synonyms: olfactory |
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| olfactology | (noun) the scientific study of smells or of the sense of smell. | - |
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| olfactory | (adjective) of or relating to olfaction | Synonyms: olfactive |
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| olibanum | (noun) an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation | Synonyms: frankincense, gum olibanum, thus |
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| oligarch | (noun) one of the rulers in an oligarchy | - |
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| oligarchic | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchical |
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| oligarchical | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchic |
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| oligarchy | (noun) a political system governed by a few people | - |
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| oligo | (noun) (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides | Synonyms: oligonucleotide |
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| oligochaete | (noun) hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body | Synonyms: oligochaete worm |
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| oligoclase | (noun) any of a series of triclinic feldspars that form rocks | Synonyms: plagioclase |
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| oligodactyly | (noun) congenital condition in which some fingers or toes are missing | - |
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| oligodendria | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendroglia |
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| oligodendrocyte | (noun) a cell of the oligodendroglia | - |
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| oligodendroglia | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendria |
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| oligodontia | (noun) congenital condition in which some of the teeth are missing | - |
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| oligomenorrhea | (noun) abnormally light or infrequent menstruation | - |
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| oligonucleotide | (noun) (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides | Synonyms: oligo |
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| oligopoly | (noun) (economics) a market in which control over the supply of a commodity is in the hands of a small number of producers and each one can influence prices and affect competitors | - |
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| oligosaccharide | (noun) any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis | - |
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| oligospermia | (noun) insufficient spermatozoa in the semen | - |
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| oliguria | (noun) production of an abnormally small amount of urine | - |
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| (noun) abnormally small production of urine; can be a symptom of kidney disease or obstruction of the urinary tract or edema or an imbalance of fluids and electrolytes in the body | - |
| olive | (adjective) of a yellow-green color similar to that of an unripe olive | - |
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| (noun) a yellow-green color of low brightness and saturation | - |
| (noun) one-seeded fruit of the European olive tree usually pickled and used as a relish | - |
| (noun) evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits | Synonyms: European olive tree, Olea europaea |
| (noun) small ovoid fruit of the European olive tree; important food and source of oil | - |
| (noun) hard yellow often variegated wood of an olive tree; used in cabinetwork | - |
| olivelike | (adjective) resembling an olive | Synonyms: olive-like |
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| olivenite | (noun) rare green to black mineral consisting of hydrated copper arsenate that is found in copper deposits | - |
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| olivine | (noun) a mineral consisting of magnesium iron silicate; a source of magnesium | - |
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| olla | (noun) leaf or strip from a leaf of the talipot palm used in India for writing paper | Synonyms: ola |
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| olm | (noun) European aquatic salamander with permanent external gills that lives in caves | Synonyms: Proteus anguinus |
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| ology | (noun) an informal word (abstracted from words with this ending) for some unidentified branch of knowledge | - |
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| olympian | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, prodigious, surpassing |
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| (adjective) majestic in manner or bearing; superior to mundane matters | Synonyms: majestic |
| omasum | (noun) the third compartment of the stomach of a ruminant | Synonyms: psalterium, third stomach |
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| ombu | (noun) fast-growing herbaceous evergreen tree of South America having a broad trunk with high water content and dark green oval leaves | Synonyms: bella sombra, Phytolacca dioica |
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| ombudsman | (noun) a government appointee who investigates complaints by private persons against the government | - |
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| omega | (noun) the last (24th) letter of the Greek alphabet | - |
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| (noun) the ending of a series or sequence | Synonyms: Z |
| omelet | (noun) beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly | Synonyms: omelette |
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| omelette | (noun) beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly | Synonyms: omelet |
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| omen | (noun) a sign of something about to happen | Synonyms: portent, presage, prodigy, prognostic, prognostication |
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| (verb) indicate, as with a sign or an omen | Synonyms: augur, auspicate, betoken, bode, forecast, foreshadow, foretell, portend, predict, prefigure, presage, prognosticate |
| omentum | (noun) a fold of peritoneum supporting the viscera | - |
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| omeprazole | (noun) antacid (trade name Prilosec) that suppresses acid secretion in the stomach | Synonyms: Prilosec |
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| omerta | (noun) a code of silence practiced by the Mafia; a refusal to give evidence to the police about criminal activities | - |
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| omicron | (noun) the 15th letter of the Greek alphabet | - |
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| ominous | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, sinister, threatening |
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| (adjective) presaging ill fortune | Synonyms: ill, inauspicious |
| ominously | (adverb) in an ominous manner | - |
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| ominousness | (noun) The quality of giving indication of a coming ill; being an evil omen; being threatening, portentous, inauspicious. | - |
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| omissible | (adjective) capable of being left out | - |
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| omission | (noun) a mistake resulting from neglect | Synonyms: skip |
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| (noun) neglecting to do something; leaving out or passing over something | - |
| (noun) any process whereby sounds or words are left out of spoken words or phrases | Synonyms: deletion |
| (noun) something that has been omitted | - |
| omissive | (adjective) characterized by omissions | - |
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| omit | (verb) leave undone or leave out | Synonyms: drop, leave out, miss, neglect, overleap, overlook, pretermit |
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| (verb) prevent from being included or considered or accepted | Synonyms: except, exclude, leave off, leave out, take out |
| ommastrephes | (noun) extremely active cylindrical squid with short strong arms and large rhombic terminal fins | - |
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| ommatidium | (noun) any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods | - |
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| omnibus | (adjective) providing for many things at once | - |
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| (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, passenger vehicle |
| (noun) an anthology of articles on a related subject or an anthology of the works of a single author | - |
| omnidirectional | (adjective) not directional | - |
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| omnifarious | (adjective) of all varieties or forms or kinds | - |
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| omnipotence | (noun) the state of being omnipotent; having unlimited power | - |
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| omnipotent | (adjective) having unlimited power | Synonyms: all-powerful, almighty |
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| omnipresence | (noun) the state of being everywhere at once (or seeming to be everywhere at once) | Synonyms: ubiquitousness, ubiquity |
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| omnipresent | (adjective) being present everywhere at once | Synonyms: ubiquitous |
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| omnirange | (noun) a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing | Synonyms: omnidirectional radio range, omnidirectional range |
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| omniscience | (noun) the state of being omniscient; having infinite knowledge | - |
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| omniscient | (adjective) infinitely wise | Synonyms: all-knowing |
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| omnivore | (noun) an animal that feeds on both animal and vegetable substances | - |
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| (noun) a person who eats all kinds of foods | - |
| omnivorous | (adjective) feeding on both plants and animals | - |
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| omnivorousness | (noun) The state of eating both animal and plant matter. | - |
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| omophagia | (noun) the eating of raw food | - |
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| omphalocele | (noun) protrusion of the intestine and omentum through a hernia in the abdominal wall near the navel; usually self correcting after birth | Synonyms: umbilical hernia |
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| omphalos | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalus, umbilicus |
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| omphaloskepsis | (noun) literally, the contemplation of one's navel, which is an idiom usually meaning complacent self-absorption | Synonyms: navel-gazing |
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| omphalus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, umbilicus |
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| on | (adjective) in operation or operational | - |
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| (adjective) (of events) planned or scheduled | - |
| (adverb) with a forward motion | Synonyms: along |
| (adverb) indicates continuity or persistence or concentration | - |
| (adverb) in a state required for something to function or be effective | - |
| onager | (noun) Asiatic wild ass | Synonyms: Equus hemionus |
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| (noun) small catapult used by the Romans | - |
| onanism | (noun) manual stimulation of the genital organs (of yourself or another) for sexual pleasure | Synonyms: masturbation |
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| (noun) a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation | Synonyms: coitus interruptus, pulling out, withdrawal, withdrawal method |