| obliging | (adjective) showing a cheerful willingness to do favors for others | Synonyms: complaisant |
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| obligingly | (adverb) in accommodation | Synonyms: accommodatingly |
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| obligingness | (noun) a disposition or tendency to yield to the will of others | Synonyms: complaisance, compliance, compliancy, deference |
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| oilrig | (noun) rig used in drilling for oil or gas | Synonyms: drill rig, drilling rig, oil rig |
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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 | - |
| origami | (noun) the Japanese art of folding paper into shapes representing objects (e.g., flowers or birds) | - |
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| origanum | (noun) any of various fragrant aromatic herbs of the genus Origanum used as seasonings | - |
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| origin | (noun) properties attributable to your ancestry | Synonyms: descent, extraction |
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| (noun) the point of intersection of coordinate axes; where the values of the coordinates are all zero | - |
| (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: inception, origination |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, bloodline, descent, line, line of descent, lineage, parentage, pedigree, stemma, stock |
| (noun) the place where something begins, where it springs into being | Synonyms: beginning, root, rootage, source |
| (noun) the source of something's existence or from which it derives or is derived | - |
| original | (adjective) being or productive of something fresh and unusual; or being as first made or thought of | - |
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| (adjective) (of e.g. information) not secondhand or by way of something intermediary | - |
| (adjective) not derived or copied or translated from something else | - |
| (adjective) preceding all others in time or being as first made or performed | - |
| (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master, master copy |
| (noun) something that serves as a model or a basis for making copies | Synonyms: archetype, pilot |
| originalism | (noun) the belief that the United States Constitution should be interpreted in the way the authors originally intended it | - |
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| originality | (noun) the quality of being new and original (not derived from something else) | - |
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| (noun) the ability to think and act independently | - |
| originally | (adverb) in an manner suggesting originality | - |
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| (adverb) with reference to the origin or beginning | Synonyms: in the beginning, primitively |
| (adverb) before now | Synonyms: earlier, in the beginning, in the first place, to begin with |
| originate | (verb) bring into being | Synonyms: initiate, start |
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| (verb) come into existence; take on form or shape | Synonyms: arise, develop, grow, rise, spring up, uprise |
| (verb) begin a trip at a certain point, as of a plane, train, bus, etc. | - |
| origination | (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, founding, initiation, innovation, instauration, institution, introduction |
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| (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: inception, origin |
| originative | (adjective) having the ability or power to create | Synonyms: creative |
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| (adjective) containing seeds of later development | Synonyms: germinal, seminal |
| originator | (noun) someone who creates new things | Synonyms: conceiver, mastermind |
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| outfight | (verb) to fight better than; get the better of | - |
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| outrigged | (adjective) rigged with a structure projecting from or over the side of a boat for various purposes; to prevent capsizing or to support an oarlock or to help secure a mast etc | - |
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| outrigger | (noun) a stabilizer for a canoe; spars attach to a shaped log or float parallel to the hull | - |
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| outright | (adjective) without reservation or exception | Synonyms: straight-out, unlimited |
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| (adverb) without reservation or concealment | - |
| (adverb) without restrictions or stipulations or further payments | - |
| (adverb) without any delay | Synonyms: in a flash, instantaneously, instantly |
| (adverb) thoroughgoing | Synonyms: downright |
| outweigh | (verb) be heavier than | - |
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| (verb) weigh more heavily | Synonyms: outbalance, overbalance, preponderate |
| overfatigue | (verb) tire excessively | Synonyms: overtire, overweary |
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| overflight | (noun) a flight by an aircraft over a particular area (especially over an area in foreign territory) | - |
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| overnight | (adjective) lasting, open, or operating through the whole night | Synonyms: all-night, nightlong |
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| (adverb) during or for the length of one night | - |
| (adverb) happening in a short time or with great speed | - |
| overnighter | (noun) a small traveling bag to carry clothing and accessories for staying overnight | Synonyms: overnight bag, overnight case |
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| (noun) a guest who stays overnight | - |
| oversight | (noun) a mistake resulting from inattention | Synonyms: lapse |
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| (noun) management by overseeing the performance or operation of a person or group | Synonyms: superintendence, supervising, supervision |
| (noun) an unintentional omission resulting from failure to notice something | Synonyms: inadvertence |
| overweight | (adjective) usually describes a large person who is fat but has a large frame to carry it | Synonyms: fleshy, heavy |
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| (noun) the property of excessive fatness | Synonyms: adiposis, corpulence, stoutness |
| paigle | (noun) early spring flower common in British isles having fragrant yellow or sometimes purple flowers | Synonyms: cowslip, Primula veris |
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| (noun) Eurasian primrose with yellow flowers clustered in a one-sided umbel | Synonyms: oxlip, Primula elatior |
| panamiga | (noun) low stingless nettle of Central and South America having velvety brownish-green toothed leaves and clusters of small green flowers | Synonyms: friendship plant, panamica, Pilea involucrata |
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| paperweight | (noun) a weight used to hold down a stack of papers | - |
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| paradigm | (noun) a standard or typical example | Synonyms: epitome, image, prototype |
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| (noun) the generally accepted perspective of a particular discipline at a given time | - |
| (noun) the class of all items that can be substituted into the same position (or slot) in a grammatical sentence (are in paradigmatic relation with one another) | Synonyms: substitution class |
| (noun) systematic arrangement of all the inflected forms of a word | - |
| paradigmatic | (adjective) of or relating to a typical example | - |
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| (adjective) of or relating to a grammatical paradigm | - |
| (adjective) related as members of a substitution class | - |
| paypig | (noun) A sexually submissive male | - |
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| pedigree | (adjective) having a list of ancestors as proof of being a purebred animal | Synonyms: pedigreed, pureblood, pureblooded, thoroughbred |
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| (noun) ancestry of a purebred animal | Synonyms: bloodline |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, stemma, stock |
| (noun) line of descent of a purebred animal | - |
| pedigreed | (adjective) having a list of ancestors as proof of being a purebred animal | Synonyms: pedigree, pureblood, pureblooded, thoroughbred |
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| peignoir | (noun) a loose dressing gown for women | Synonyms: housecoat, neglige, negligee, wrapper |
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| pemphigous | (adjective) of or relating to or manifesting pemphigus | - |
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| pemphigus | (noun) a skin disease characterized by large thin-walled blisters (bullae) arising from normal skin or mucous membrane | - |
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| penlight | (noun) a small flashlight resembling a fountain pen | - |
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| pennyweight | (noun) a unit of apothecary weight equal to 24 grains | - |
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| perigee | (noun) periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth | - |
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| perigon | (noun) an angle of 360 degrees | Synonyms: round angle |
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| perigonal | (adjective) of or relating to a perigone | - |
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| perigone | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigonium |
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| perigonium | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigone |
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| periwig | (noun) a wig for men that was fashionable in the 17th and 18th centuries | Synonyms: peruke |
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| periwigged | (adjective) wearing a wig popular for men in the 17th and 18th centuries | Synonyms: peruked |
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| pfennig | (noun) 100 pfennigs formerly equaled 1 Deutsche Mark in Germany | - |
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| photopigment | (noun) a special pigment found in the rods and cones of the retina | - |
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| physostigmine | (noun) used in treatment of Alzheimer's disease and glaucoma | - |
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| pig | (noun) domestic swine | Synonyms: grunter, hog, squealer, Sus scrofa |
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| (noun) a crude block of metal (lead or iron) poured from a smelting furnace | - |
| (noun) mold consisting of a bed of sand in which pig iron is cast | Synonyms: pig bed |
| (noun) a person regarded as greedy and pig-like | Synonyms: hog |
| (noun) uncomplimentary terms for a policeman | Synonyms: bull, cop, copper, fuzz |
| (noun) a coarse obnoxious person | Synonyms: slob, sloven, slovenly person |
| (verb) give birth to (piglets) | Synonyms: farrow |
| (verb) eat greedily | Synonyms: devour, guttle, raven |
| (verb) live like a pig, in squalor | Synonyms: pig it |
| pigboat | (noun) a submersible warship usually armed with torpedoes | Synonyms: sub, submarine |
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| pigeon | (noun) wild and domesticated birds having a heavy body and short legs | - |
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| pigeonhole | (noun) a small compartment | Synonyms: cubbyhole |
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| (noun) a specific (often simplistic) category | - |
| (verb) treat or classify according to a mental stereotype | Synonyms: stamp, stereotype |
| (verb) place into a small compartment | - |
| pigeonholing | (noun) a system for classifying things into groups | Synonyms: grouping |
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| pigfish | (noun) found from Long Island southward | Synonyms: hogfish, Orthopristis chrysopterus |
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| (noun) found around the Great Barrier Reef | Synonyms: Achoerodus gouldii, giant pigfish |
| piggery | (noun) a farm where pigs are raised or kept | Synonyms: pig farm |
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| piggish | (adjective) resembling swine; coarsely gluttonous or greedy | Synonyms: hoggish, piggy, porcine, swinish |
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| piggishly | (adverb) in a piggish manner | - |
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| piggishness | (noun) an excessive desire for food | Synonyms: greediness, hoggishness |
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| piggy | (adjective) resembling swine; coarsely gluttonous or greedy | Synonyms: hoggish, piggish, porcine, swinish |
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| (noun) a young pig | Synonyms: piglet, shoat, shote |
| piggyback | (noun) the act of carrying something piggyback | - |
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| (adverb) on the back or shoulder or astraddle on the hip | Synonyms: pickaback, pig-a-back |
| (adverb) on a railroad flatcar | Synonyms: pickaback, pig-a-back |
| (verb) bring into alignment with | - |
| (verb) support on the back and shoulders | - |
| (verb) haul by railroad car | - |
| (verb) haul truck trailers loaded with commodities on railroad cars | - |
| (verb) ride on someone's shoulders or back | - |
| pigheaded | (adjective) obstinate and stupid | Synonyms: bullet-headed, bullheaded |
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| pigheadedness | (noun) resolute adherence to your own ideas or desires | Synonyms: bullheadedness, obstinacy, obstinance, self-will, stubbornness |
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| piglet | (noun) a young pig | Synonyms: piggy, shoat, shote |
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| pigman | (noun) a herder or swine | Synonyms: swineherd |
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| pigment | (noun) a substance used as a coating to protect or decorate a surface (especially a mixture of pigment suspended in a liquid); dries to form a hard coating | Synonyms: paint |
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| (noun) dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.) | - |
| (noun) any substance whose presence in plant or animal tissues produces a characteristic color | - |
| (verb) color or dye with a pigment | - |
| (verb) acquire pigment; become colored or imbued | - |
| pigmentation | (noun) coloration of living tissues by pigment | - |
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| (noun) the deposition of pigment in animals or plants or human beings | - |
| pigmy | (noun) an unusually small individual | Synonyms: pygmy |
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| pignolia | (noun) edible seed of any of several nut pines especially some pinons of southwestern North America | Synonyms: pine nut, pinon nut |
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| pignut | (noun) an American hickory tree having bitter nuts | Synonyms: black hickory, brown hickory, Carya glabra, pignut hickory |
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| pigpen | (noun) a pen for swine | Synonyms: pigsty, sty |
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| pigskin | (noun) leather from the skin of swine | - |
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| pigsticking | (noun) the sport of hunting wild boar with spears | - |
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| pigsty | (noun) a pen for swine | Synonyms: pigpen, sty |
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| pigswill | (noun) wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk | Synonyms: pigwash, slop, slops, swill |
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| pigtail | (noun) a plait of braided hair | - |
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| pigwash | (noun) wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk | Synonyms: pigswill, slop, slops, swill |
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| pigweed | (noun) leaves collected from the wild | Synonyms: lamb's-quarter, wild spinach |
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| (noun) common weedy European plant introduced into North America; often used as a potherb | Synonyms: Chenopodium album, lamb's-quarters, wild spinach |
| (noun) leaves sometimes used as potherbs; seeds used as cereal; southern United States to Central America; India and China | Synonyms: Amaranthus hypochondriacus |
| plantigrade | (adjective) (of mammals) walking on the whole sole of the foot (as rabbits, raccoons, bears, and humans do) | - |
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| (noun) an animal that walks with the entire sole of the foot touching the ground as e.g. bears and human beings | Synonyms: plantigrade mammal |
| playwright | (noun) someone who writes plays | Synonyms: dramatist |
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| plexiglass | (noun) a light transparent weather resistant thermoplastic | Synonyms: Plexiglas |
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| plight | (noun) a solemn pledge of fidelity | Synonyms: troth |
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| (noun) a situation from which extrication is difficult especially an unpleasant or trying one | Synonyms: predicament, quandary |
| (verb) promise solemnly and formally | Synonyms: pledge |
| (verb) give to in marriage | Synonyms: affiance, betroth, engage |