| penetralium | (noun) the innermost parts | - |
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| penetration | (noun) an attack that penetrates into enemy territory | Synonyms: incursion |
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| (noun) the act of entering into or through something | - |
| (noun) the act (by a man) of inserting his penis into the vagina of a woman | - |
| (noun) the depth to which something penetrates (especially the depth reached by a projectile that hits a target) | - |
| (noun) the ability to make way into or through something | - |
| (noun) clear or deep perception of a situation | Synonyms: insight |
| penetrator | (noun) an intruder who passes into or through (often by overcoming resistance) | - |
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| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| pentylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentamethylenetetrazol |
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| perestroika | (noun) an economic policy adopted in the former Soviet Union; intended to increase automation and labor efficiency but it led eventually to the end of central planning in the Russian economy | - |
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| perpetration | (noun) the act of committing a crime | Synonyms: commission, committal |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| pesantran | (noun) a Muslim school in Indonesia operated by religious leaders | Synonyms: pesantren |
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| pesantren | (noun) a Muslim school in Indonesia operated by religious leaders | Synonyms: pesantran |
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| petrel | (noun) relatively small long-winged tube-nosed bird that flies far from land | - |
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| petrifaction | (noun) a rock created by petrifaction; an organic object infiltrated with mineral matter and preserved in its original form | - |
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| (noun) the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape | Synonyms: petrification |
| petrification | (noun) the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape | Synonyms: petrifaction |
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| petrissage | (noun) massage of the skin which is gently lifted and squeezed | - |
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| petrochemical | (noun) any compound obtained from petroleum or natural gas | - |
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| petroglyph | (noun) a carving or line drawing on rock (especially one made by prehistoric people) | - |
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| petrol | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasolene, gasoline |
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| petrolatum | (noun) a semisolid mixture of hydrocarbons obtained from petroleum; used in medicinal ointments and for lubrication | Synonyms: mineral jelly, petroleum jelly |
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| petroleum | (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, oil, rock oil |
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| petrology | (noun) the branch of geology that studies rocks: their origin and formation and mineral composition and classification | Synonyms: lithology |
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| philtre | (noun) a drink credited with magical power; can make the one who takes it love the one who gave it | Synonyms: love-philter, love-philtre, love-potion, philter |
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| photochemistry | (noun) branch of chemistry that deals with the chemical action of light | - |
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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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| photometrician | (noun) someone who practices photometry | Synonyms: photometrist |
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| photometrist | (noun) someone who practices photometry | Synonyms: photometrician |
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| photometry | (noun) measurement of the properties of light (especially luminous intensity) | - |
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| phototropism | (noun) an orienting response to light | - |
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| phratry | (noun) people descended from a common ancestor | Synonyms: family, family line, folk, kinfolk, kinsfolk, sept |
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| physiatrics | (noun) therapy that uses physical agents: exercise and massage and other modalities | Synonyms: physical therapy, physiotherapy |
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| phytochemistry | (noun) the branch of organic chemistry dealing with the chemistry of plants | - |
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| piastre | (noun) a fractional monetary unit in Egypt and Lebanon and Sudan and Syria | Synonyms: piaster |
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| (noun) 100 kurus equal 1 lira in Turkey | Synonyms: kurus, piaster |
| picometre | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometer |
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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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| pinstripe | (noun) a very thin stripe (especially a white stripe on a dark fabric) | - |
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| (noun) a fabric with very thin stripes | - |
| (noun) a suit made from a fabric with very thin stripes | - |
| pipistrel | (noun) small European brown bat | Synonyms: pipistrelle, Pipistrellus pipistrellus |
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| pipistrelle | (noun) small European brown bat | Synonyms: pipistrel, Pipistrellus pipistrellus |
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| plastron | (noun) (zoology) the part of a turtle's shell forming its underside | - |
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| (noun) a large pad worn by a fencer to protect the chest | - |
| (noun) a metal breastplate that was worn under a coat of mail | - |
| (noun) the front of man's dress shirt | - |
| (noun) the ornamental front of a woman's bodice or shirt | - |
| pleasantry | (noun) an agreeable or amusing remark | - |
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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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| pleximetry | (noun) tapping a part of the body for diagnostic purposes | Synonyms: percussion |
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| pneumogastric | (noun) a mixed nerve that supplies the pharynx and larynx and lungs and heart and esophagus and stomach and most of the abdominal viscera | Synonyms: nervus vagus, pneumogastric nerve, tenth cranial nerve, vagus, vagus nerve, wandering nerve |
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| podiatrist | (noun) a specialist in care for the feet | Synonyms: chiropodist, foot doctor |
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| podiatry | (noun) the branch of medicine concerned with the feet | Synonyms: chiropody |
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| poetry | (noun) literature in metrical form | Synonyms: poesy, verse |
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| (noun) any communication resembling poetry in beauty or the evocation of feeling | - |
| pointrel | (noun) a tool used by an engraver | Synonyms: graver, graving tool, pointel |
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| poltroon | (noun) an abject coward | Synonyms: craven, recreant |
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| poltroonery | (noun) abject pusillanimity | - |
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| polyelectrolyte | (noun) an electrolyte of high molecular weight | - |
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| polymetry | (noun) The combining of different metres simultaneously. | - |
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| polypropenonitrile | (noun) acrylic resin used to make a strong soft crease-resistant fabric (trade name Acrilan) | Synonyms: Acrilan |
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| polytetrafluoroethylene | (noun) a material used to coat cooking utensils and in industrial applications where sticking is to be avoided | Synonyms: Teflon |
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| portrait | (noun) any likeness of a person, in any medium | Synonyms: portrayal |
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| (noun) a word picture of a person's appearance and character | Synonyms: portraiture, portrayal |
| portraitist | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portrayer |
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| portraiture | (noun) the activity of making portraits | - |
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| (noun) a word picture of a person's appearance and character | Synonyms: portrait, portrayal |
| portrayal | (noun) representation by drawing or painting etc | Synonyms: delineation, depiction |
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| (noun) acting the part of a character on stage; dramatically representing the character by speech and action and gesture | Synonyms: characterization, enactment, personation |
| (noun) any likeness of a person, in any medium | Synonyms: portrait |
| (noun) a representation by picture or portraiture | Synonyms: depicting, depiction, portraying |
| (noun) a word picture of a person's appearance and character | Synonyms: portrait, portraiture |
| portrayer | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portraitist |
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| portraying | (noun) a representation by picture or portraiture | Synonyms: depicting, depiction, portrayal |
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| positron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: antielectron |
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| postmistress | (noun) a woman postmaster | - |
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| poultry | (noun) a domesticated gallinaceous bird thought to be descended from the red jungle fowl | Synonyms: domestic fowl, fowl |
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| (noun) flesh of chickens or turkeys or ducks or geese raised for food | - |
| poultryman | (noun) a dealer in poultry and poultry products | Synonyms: poulterer |
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| pretrial | (noun) (law) a conference held before the trial begins to bring the parties together to outline discovery proceedings and to define the issues to be tried; more useful in civil than in criminal cases | Synonyms: pretrial conference |
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| propenonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: acrylonitrile, vinyl cyanide |
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| proprietress | (noun) a woman proprietor | - |
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| prostration | (noun) the act of assuming a prostrate position | - |
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| (noun) abject submission; the emotional equivalent of prostrating your body | - |
| (noun) an abrupt failure of function or complete physical exhaustion | Synonyms: collapse |
| protraction | (noun) the act of prolonging something | Synonyms: lengthening, perpetuation, prolongation |
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| (noun) the consequence of being lengthened in duration | Synonyms: continuation, lengthiness, prolongation |
| protractor | (noun) drafting instrument used to draw or measure angles | - |
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| protriptyline | (noun) tricyclic antidepressant used to treat clinical depression | - |
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| protrusion | (noun) the act of projecting out from something | Synonyms: jut, jutting, projection |
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| (noun) something that bulges out or is protuberant or projects from its surroundings | Synonyms: bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protuberance, swelling |
| psychiatrist | (noun) a physician who specializes in psychiatry | Synonyms: head-shrinker, shrink |
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| psychiatry | (noun) the branch of medicine dealing with the diagnosis and treatment of mental disorders | Synonyms: psychological medicine, psychopathology |
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| psychometrics | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrika, psychometry |
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| psychometrika | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrics, psychometry |
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| psychometry | (noun) any branch of psychology concerned with psychological measurements | Synonyms: psychometrics, psychometrika |
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| puppetry | (noun) a stilted dramatic performance (as if by puppets) | - |
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| (noun) the art of making puppets and presenting puppet shows | - |
| putrefaction | (noun) moral perversion; impairment of virtue and moral principles | Synonyms: corruption, degeneracy, depravation, depravity |
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| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, decomposition, rot, rotting |
| (noun) a state of decay usually accompanied by an offensive odor | Synonyms: rot |
| putrescence | (noun) the quality of rotting and becoming putrid | Synonyms: rottenness |
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| (noun) in a state of progressive putrefaction | Synonyms: corruption, putridness, rottenness |
| putrescine | (noun) a colorless crystalline ptomaine with a foul odor that is produced in decaying animal matter | - |
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| putridity | (noun) the state of being putrid | - |
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| putridness | (noun) in a state of progressive putrefaction | Synonyms: corruption, putrescence, rottenness |
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| pycnometry | (noun) The determination of liquid density by weighing the liquid in a container (pycnometer) of known volume. | - |
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| pyrochemistry | (noun) processes for chemical reactions at high temperatures | Synonyms: pyrochemical process |
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| pyroelectricity | (noun) generation of an electric charge on certain crystals (such as tourmaline) as a result of a change in temperature | - |
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| pyrolatry | (noun) the worship of fire | Synonyms: fire-worship |
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| quatrain | (noun) a stanza of four lines | - |
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| quattrocento | (noun) the 15th century in Italian art and literature | - |
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| quercitron | (noun) medium to large deciduous timber tree of the eastern United States and southeastern Canada having dark outer bark and yellow inner bark used for tanning; broad five-lobed leaves are bristle-tipped | Synonyms: black oak, quercitron oak, Quercus velutina, yellow oak |
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| (noun) a yellow dye made from the bark of the quercitron oak tree | - |
| racetrack | (noun) a course over which races are run | Synonyms: racecourse, raceway, track |
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| radiochemistry | (noun) the chemistry of radioactive substances | Synonyms: nuclear chemistry |
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| rattrap | (noun) a trap for catching rats | - |
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| (noun) filthy run-down dilapidated housing | - |
| (noun) a difficult entangling situation | - |
| recalcitrance | (noun) the trait of being unmanageable | Synonyms: recalcitrancy, refractoriness, unmanageableness |
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| recalcitrancy | (noun) the trait of being unmanageable | Synonyms: recalcitrance, refractoriness, unmanageableness |
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| reconnoitring | (noun) exploring in order to gain information | Synonyms: exploratory survey, reconnoitering, scouting |
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| reconstruction | (noun) the activity of constructing something again | - |
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| (noun) recall that is hypothesized to work by storing abstract features which are then used to construct the memory during recall | Synonyms: reconstructive memory |
| (noun) an interpretation formed by piecing together bits of evidence | - |
| redistribution | (noun) distributing again | - |
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| reentry | (noun) the act of entering again | - |
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| registrant | (noun) a person who is formally entered (along with others) in a register (and who obtains certain rights thereby) | - |
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