| osmoreceptor | (noun) sensory end organ that responds to changes in osmotic pressure | - |
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| ovariectomy | (noun) surgical removal of one or both ovaries | Synonyms: oophorectomy |
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| overprotection | (noun) excessive protection | Synonyms: momism, overshielding |
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| overreckoning | (noun) a calculation that results in an estimate that is too high | Synonyms: overestimate, overestimation, overrating |
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| palaeoecology | (noun) the branch of ecology that studies ancient ecology | Synonyms: paleoecology |
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| paleoecology | (noun) the branch of ecology that studies ancient ecology | Synonyms: palaeoecology |
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| pancreatectomy | (noun) surgical removal of part or all of the pancreas | - |
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| panhysterectomy | (noun) surgical removal of the uterus and the ovaries and oviducts and cervix and related lymph nodes | Synonyms: radical hysterectomy |
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| pantechnicon | (noun) a large moving van (especially one used for moving furniture) | - |
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| paramecia | (noun) any member of the genus Paramecium | Synonyms: paramecium |
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| paramecium | (noun) any member of the genus Paramecium | Synonyms: paramecia |
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| parsec | (noun) a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years | Synonyms: secpar |
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| paycheck | (noun) a check issued in payment of wages or salary | Synonyms: payroll check |
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| peasecod | (noun) husk of a pea; edible in some garden peas | Synonyms: pea pod |
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| pecan | (noun) smooth brown oval nut of south central United States | - |
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| (noun) tree of southern United States and Mexico cultivated for its nuts | Synonyms: Carya illinoensis, Carya illinoinsis, pecan tree |
| (noun) wood of a pecan tree | - |
| peccadillo | (noun) a petty misdeed | Synonyms: indiscretion |
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| peccary | (noun) nocturnal gregarious pig-like wild animals of North America and South America | Synonyms: musk hog |
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| peck | (noun) a light kiss | - |
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| (noun) bite by a bird | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| (noun) a United States dry measure equal to 8 quarts or 537.605 cubic inches | - |
| (noun) a British imperial capacity measure (liquid or dry) equal to 2 gallons | - |
| pecker | (noun) bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects | Synonyms: peckerwood, woodpecker |
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| (noun) horny projecting mouth of a bird | Synonyms: beak, bill, neb, nib |
| (noun) obscene terms for penis | Synonyms: cock, dick, prick, putz, shaft, tool |
| peckerwood | (noun) bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects | Synonyms: pecker, woodpecker |
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| pecopteris | (noun) Carboniferous fossil fern characterized by a regular arrangement of the leaflets resembling a comb | - |
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| pecs | (noun) either of two large muscles of the chest | Synonyms: musculus pectoralis, pectoral, pectoral muscle, pectoralis |
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| pectin | (noun) any of various water-soluble colloidal carbohydrates that occur in ripe fruit and vegetables; used in making fruit jellies and jams | - |
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| pectoral | (noun) an adornment worn on the chest or breast | Synonyms: pectoral medallion |
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| (noun) either of two large muscles of the chest | Synonyms: musculus pectoralis, pecs, pectoral muscle, pectoralis |
| pectoralis | (noun) either of two large muscles of the chest | Synonyms: musculus pectoralis, pecs, pectoral, pectoral muscle |
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| pectus | (noun) the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates | Synonyms: chest, thorax |
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| peculation | (noun) the fraudulent appropriation of funds or property entrusted to your care but actually owned by someone else | Synonyms: defalcation, embezzlement, misapplication, misappropriation |
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| peculator | (noun) someone who violates a trust by taking (money) for his own use | Synonyms: defalcator, embezzler |
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| peculiarity | (noun) something unusual -- perhaps worthy of collecting | Synonyms: curio, curiosity, oddity, oddment, rarity |
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| (noun) a distinguishing trait | Synonyms: distinctiveness, speciality, specialness, specialty |
| (noun) an odd or unusual characteristic | Synonyms: distinctive feature, distinguishing characteristic |
| pedelec | (noun) a bicycle built with a motor to aid the cyclist to turn the pedals | - |
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| pelecypod | (noun) marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together | Synonyms: bivalve, lamellibranch |
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| pentecostalism | (noun) the principles and practices of Pentecostal religious groups; characterized by religious excitement and talking in tongues | - |
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| perfect | (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect tense, perfective, perfective tense |
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| perfecta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: exacta |
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| perfecter | (noun) a skilled worker who perfects something | - |
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| perfectibility | (noun) the capability of becoming perfect | - |
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| perfection | (noun) the act of making something perfect | - |
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| (noun) an ideal instance; a perfect embodiment of a concept | Synonyms: beau ideal, idol, paragon |
| (noun) the state of being without a flaw or defect | Synonyms: flawlessness, ne plus ultra |
| perfectionism | (noun) a disposition to feel that anything less than perfect is unacceptable | - |
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| perfectionist | (noun) a person who is displeased by anything that does not meet very high standards | - |
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| perfective | (noun) the aspect of a verb that expresses a completed action | Synonyms: perfective aspect |
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| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect, perfect tense, perfective tense |
| perithecium | (noun) flask-shaped ascocarp | - |
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| perleche | (noun) a disorder of the lips marked by scaling and fissures at the corners of the mouth; caused by a deficiency of riboflavin | Synonyms: cheilosis |
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| persecution | (noun) the act of persecuting (especially on the basis of race or religion) | - |
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| persecutor | (noun) someone who torments | Synonyms: tormenter, tormentor |
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| perspective | (noun) the appearance of things relative to one another as determined by their distance from the viewer | Synonyms: linear perspective |
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| (noun) a way of regarding situations or topics etc. | Synonyms: position, view |
| petechia | (noun) a minute red or purple spot on the surface of the skin as the result of tiny hemorrhages of blood vessels in the skin (as in typhoid fever) | - |
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| phlebectomy | (noun) surgical removal or all or part of a vein; sometimes done in cases of severe varicose veins | - |
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| photoelectricity | (noun) electricity generated by light or affected by light | - |
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| photoelectron | (noun) an electron that is emitted from an atom or molecule by an incident photon | - |
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| photomechanics | (noun) the technique of using photomechanical methods to make photographs into plates for printing | - |
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| (noun) the process whereby printing surfaces (plates or cylinders) are produced by photographic methods | Synonyms: photoplate making |
| picosecond | (noun) one trillionth (10^-12) of a second; one thousandth of a nanosecond | - |
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| piece | (noun) a separate part of a whole | - |
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| (noun) game equipment consisting of an object used in playing certain board games | Synonyms: man |
| (noun) a portable gun | Synonyms: firearm, small-arm |
| (noun) a work of art of some artistic value | Synonyms: art object, objet d'art |
| (noun) an item that is an instance of some type | Synonyms: part |
| (noun) a distance | - |
| (noun) a musical work that has been created | Synonyms: composition, musical composition, opus, piece of music |
| (noun) an artistic or literary composition | - |
| (noun) an instance of some kind | Synonyms: bit |
| (noun) a serving that has been cut from a larger portion | Synonyms: slice |
| (noun) a portion of a natural object | Synonyms: part |
| (noun) a share of something | Synonyms: slice |
| (noun) a period of indeterminate length (usually short) marked by some action or condition | Synonyms: patch, spell, while |
| piecework | (noun) work paid for according to the quantity produced | - |
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| piezoelectricity | (noun) electricity produced by mechanical pressure on certain crystals (notably quartz or Rochelle salt); alternatively, electrostatic stress produces a change in the linear dimensions of the crystal | Synonyms: piezo effect, piezoelectric effect |
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| pinchbeck | (noun) an alloy of copper and zinc that is used in cheap jewelry to imitate gold | - |
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| pinecone | (noun) the seed-producing cone of a pine tree | - |
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| pinguecula | (noun) a slightly elevated elastic tissue deposit in the conjunctiva that may extend to the cornea but does not cover it | - |
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| pipeclay | (noun) fine white clay used in making tobacco pipes and pottery and in whitening leather | Synonyms: terra alba |
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| plecopteran | (noun) primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones | Synonyms: stone fly, stonefly |
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| plectognath | (noun) tropical marine fishes having the teeth fused into a beak and thick skin covered with bony plates or spines | Synonyms: plectognath fish |
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| plectranthus | (noun) any of various ornamental plants of the genus Plectranthus | - |
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| plectron | (noun) a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument | Synonyms: pick, plectrum |
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| plectrum | (noun) a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument | Synonyms: pick, plectron |
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| pluperfect | (noun) a perfective tense used to express action completed in the past | Synonyms: past perfect, past perfect tense, pluperfect tense |
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| pneumonectomy | (noun) surgical removal of a lung (usually to treat lung cancer) | - |
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| poeciliid | (noun) small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control | Synonyms: live-bearer, poeciliid fish, topminnow |
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| polecat | (noun) dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened | Synonyms: fitch, foulmart, foumart, Mustela putorius |
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| (noun) American musteline mammal typically ejecting an intensely malodorous fluid when startled; in some classifications put in a separate subfamily Mephitinae | Synonyms: skunk, wood pussy |
| polyelectrolyte | (noun) an electrolyte of high molecular weight | - |
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| polypectomy | (noun) surgical removal of a polyp | - |
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| polytechnic | (noun) a technical school offering instruction in many industrial arts and applied sciences | Synonyms: engineering school, polytechnic institute |
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| precalc | (noun) a college-level algebra and trigonometry course that is designed to prepare students for the study of calculus | Synonyms: precalculus |
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| precalculus | (noun) a college-level algebra and trigonometry course that is designed to prepare students for the study of calculus | Synonyms: precalc |
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| precariousness | (noun) extreme dangerousness | - |
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| (noun) being unsettled or in doubt or dependent on chance | Synonyms: uncertainness, uncertainty |
| precaution | (noun) a precautionary measure warding off impending danger or damage or injury etc. | Synonyms: guard, safeguard |
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| (noun) the trait of practicing caution in advance | - |
| (noun) judiciousness in avoiding harm or danger | Synonyms: care, caution, forethought |
| precava | (noun) receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins | Synonyms: superior vena cava |
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| precedence | (noun) the act of preceding in time or order or rank (as in a ceremony) | Synonyms: precedency, precession |
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| (noun) preceding in time | Synonyms: antecedence, antecedency, anteriority, precedency, priority |
| (noun) status established in order of importance or urgency | Synonyms: precedency, priority |
| precedency | (noun) the act of preceding in time or order or rank (as in a ceremony) | Synonyms: precedence, precession |
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| (noun) preceding in time | Synonyms: antecedence, antecedency, anteriority, precedence, priority |
| (noun) status established in order of importance or urgency | Synonyms: precedence, priority |
| precedent | (noun) an example that is used to justify similar occurrences at a later time | Synonyms: case in point |
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| (noun) (civil law) a law established by following earlier judicial decisions | Synonyms: case law, common law |
| (noun) a subject mentioned earlier (preceding in time) | - |
| (noun) a system of jurisprudence based on judicial precedents rather than statutory laws | Synonyms: case law, common law |
| precentor | (noun) the musical director of a choir | Synonyms: cantor, choirmaster |
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| precentorship | (noun) the position of precentor | - |
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| precept | (noun) a doctrine that is taught | Synonyms: commandment, teaching |
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| (noun) rule of personal conduct | Synonyms: principle |
| preceptor | (noun) teacher at a university or college (especially at Cambridge or Oxford) | Synonyms: don |
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| preceptorship | (noun) the position of preceptor | - |
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| precession | (noun) the act of preceding in time or order or rank (as in a ceremony) | Synonyms: precedence, precedency |
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| (noun) the motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone | - |
| prechlorination | (noun) chlorination prior to another chemical process | - |
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| precinct | (noun) a district of a city or town marked out for administrative purposes | - |
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| preciosity | (noun) the quality of being fastidious or excessively refined | Synonyms: preciousness |
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| preciousness | (noun) the positive quality of being precious and beyond value | Synonyms: invaluableness, pricelessness, valuableness |
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| (noun) the quality of being fastidious or excessively refined | Synonyms: preciosity |
| (noun) the quality possessed by something with a great price or value | Synonyms: costliness, dearness |
| precipice | (noun) a very steep cliff | - |
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| precipitance | (noun) the quality of happening with headlong haste or without warning | Synonyms: abruptness, precipitancy, precipitateness, precipitousness, suddenness |
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| precipitancy | (noun) the quality of happening with headlong haste or without warning | Synonyms: abruptness, precipitance, precipitateness, precipitousness, suddenness |
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| precipitant | (noun) an agent that causes a precipitate to form | - |
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| precipitate | (noun) a precipitated solid substance in suspension or after settling or filtering | - |
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| precipitateness | (noun) the quality of happening with headlong haste or without warning | Synonyms: abruptness, precipitance, precipitancy, precipitousness, suddenness |
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| precipitation | (noun) an unexpected acceleration or hastening | - |
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| (noun) overly eager speed (and possible carelessness) | Synonyms: haste, hastiness, hurriedness, hurry |
| (noun) the act of casting down or falling headlong from a height | - |
| (noun) the falling to earth of any form of water (rain or snow or hail or sleet or mist) | Synonyms: downfall |
| (noun) the process of forming a chemical precipitate | - |
| (noun) the quantity of water falling to earth at a specific place within a specified period of time | - |
| precipitator | (noun) removes dust particles from gases by electrostatic precipitation | Synonyms: Cottrell precipitator, electrostatic precipitator |
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| precipitin | (noun) an antibody that causes precipitation when it unites with its antigen | - |
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| precipitousness | (noun) the property possessed by a slope that is very steep | Synonyms: abruptness, steepness |
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| (noun) the quality of happening with headlong haste or without warning | Synonyms: abruptness, precipitance, precipitancy, precipitateness, suddenness |
| precis | (noun) a sketchy summary of the main points of an argument or theory | Synonyms: abstract, outline, synopsis |
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| preciseness | (noun) the quality of being reproducible in amount or performance | Synonyms: precision |
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| (noun) clarity as a consequence of precision | Synonyms: clearcutness |