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paleologismAn obsolete term.paleostreamAn ancient river channel or course.pampiniform(botany, anatomy) In the form of tendrils.pampsychismAlternative spelling of panpsychism.panchromium(obsolete) An early proposed name for the element vanadiumpancuronium(pharmacology) A synthetic steroid which is used as a neuromuscular blocking agent.pandamonium(humorous) Furore caused by or involving giant pandas.pandemonismBelief in a universe that is infused with an evil spirit.pandemoniumA loud, wild, tumultuous protest, disorder, or chaotic situation, usually of a crowd, often violent.panduriform(botany, rare) Pandurate.panentheism(philosophy, religion) A doctrine that the universe subsists within God, but that God nevertheless transcends or has some existence separate from the universe.paneulogismeulogy of everything; indiscriminate praisepanjandarumAlternative spelling of panjandrum.panopticismThe state or quality of being panoptic; all-seeingness.panpsychism(uncountable) The belief that all matter is conscious in some form.panspermismSynonym of panspermatism.pantonalism(music) Pantonality.panvitalismBelief that all things are part of a single living universe.papaveretumA mixture of hydrochloride salts of opium alkaloids, used for pain relief and sedation.papilliformShaped like a papilla.paraballism(medicine) Ballism that affects both legs.parachutismThe act of jumping from an aircraft using a parachute.paracladium(botany) A branch that has the same branching structure as the main axisparacranium(anatomy) The external periosteum that covers the outer surface of the skullparacymbium(entomology) In certain male spiders, an appendage extending from the cymbium.parafascismAlternative spelling of para-fascism.parallelismThe state or condition of being parallel; agreement in direction, tendency, or character.paramaeciumArchaic form of paramecium.parametrium(anatomy) All the connective tissue of the female pelvic floor.paramoeciumAlternative spelling of paramecium.paranoidism(archaic) Synonym of paranoia (“delusional disorder”).paraphyllum(botany) A small foliaceous organ between the leaves of some mosses.parapleurumOne of the pleura or sternal side-pieces in a beetle, etc.parascenium(Ancient Greece, theater) One of two apartments adjoining the ancient stage, probably used as dressing rooms.parasynonym(linguistics) A term (word or phrase) which is parasynonymous with others, but not necessarily considered a synonym.parathecium(biology) The hyphal layer of the apothecium of a lichenparentalismThe act or status of a parent.paronychiumperionychiumparricidismThe practice of parricide.partisanismThe practices of partisans; partisanship.paspalitrem(organic chemistry) Any of a group of tremorgenic mycotoxins present in the bark of Cavendishia pubescens, and in Claviceps paspali.passeriformOf or pertaining to a sparrow; sparrow-like; bird-like.pastoralismThe state of being pastoral.patelliformHaving the shape of a patella.paternalismThe treatment of people in a fatherly manner, especially by caring for them and sometimes being stern with them.patheticismPathetic behavior.pathosystem(biology) An ecosystem based on parasitismpatrocinium(historical) The distinctive relationship in Ancient Roman society between a patron and a client.paxilliform(zoology) Resembling a paxilla.pectiniformHaving the form of a comb; pectinate.peculiarismPeculiarity; strange behavior.pedobaptismAlternative form of paedobaptism.pelargoniumAny of various flowering plants of the genus Pelargonium, similar to (and often confused with) true geraniums, but less hardy and often cultivated as annuals for ornamental purposes.pelmatogram(rare) An imprint of the sole or plantar surface of a foot, such as may be made by pressing an inked foot onto paper or a greased foot in plaster of Paris.penetraliumthe innermost (or most secret) part of a building; an inner sanctum; a sanctum sanctorum.penicilliumAny of the blue-green fungi, of the genus Penicillium, that are used in the manufacture of cheeses, and are an important source of antibiotics.pentadrachm(historical) An ancient Cyrenaic coin that was worth five drachmas.pentagonismIn leftist political thought, a stage beyond imperialism embodied by the United States.pentamerismfive-part radial symmetrypentanidium(organic chemistry) Any of a class of catalytic bicyclic heterocyclic cationspentasodium(chemistry, in combination) Five sodium atoms or ions in a compoundpentatonism(music) pentatonicismpenthusiasm(informal) Enthusiasm for writing.pentoliniumA ganglionic blocking agent that acts as a nicotinic acetylcholine receptor antagonist and is used as an antihypertensive drug.peregrinismThe quality of being peregrine.perianthium(botany, archaic) The perianth.pericambium(biology, dated) A pericycle.pericardium(anatomy, cardiology) A serous membrane that surrounds the heart allowing it to contract.periclinium(botany) The involucre that surrounds the common receptacle in composite flowers.pericranium(anatomy) The membrane (or periosteum) which covers the outer surface of the skull.peridermium(mycology) A blister-shaped aecium found in some fungi.peridesmium(anatomy) The areolar tissue around a ligament.perimetrium(anatomy) The outer serosa layer of the uterus.perineurium(anatomy) The sheath of connective tissue that surrounds a fascicle of nerve fibresperiodogram(mathematics) A graph used in the harmonic analysis of spectra, time series etc.periscopismPeriscopic vision, covering a wide field without changing the direction of the optical axis.perisporium(mycology) the outer part of a spore wall which often disappears in older spores.peristylium(chiefly in ancient Roman contexts) A peristyle.perithecium(mycology) An ascocarp shaped like a skittle or ball, distinguished by a small pore, the ostiole, through which the spores are released one by one when ripe.perithelium(anatomy) The layer of connective tissue surrounding the capillaries and smaller blood vesselsperitonaeumAlternative form of peritoneum.personalismThe character of being personal.pervigilium(obsolete, medicine, rare) Insomnia.phagocytismThe nature or function of a phagocyte.phanaticism(hypercorrect) Archaic spelling of fanaticism.phenazinium(organic chemistry, especially in combination) A cation formed by protonation of a phenazinepheneticism(systematics) Support for the system of phenetics.phenomenismphenomenalismphenoxenium(organic chemistry) An unstable cation resulting from loss of a hydride ion from the hydroxyl group of a phenolphenoxonium(organic chemistry) A cation produced by removing two electrons and a hydrogen ion from phenol (C₆H₅O⁺)phlyctidium(medicine, obsolete) A kind of large blister.phoneticismThe phonetic representation of soundsphosphenium(inorganic chemistry) The radical cation H₂P:⁺ derived from phosphinephosphoform(biochemistry) The phosphorylated form of a proteinphosphonium(chemistry) the tetravalent positively-charged phosphorus cation R₄P⁺phosphorismchronic phosphorus poisoningphotostream(computing) A gallery or slideshow displaying a series of images from the Internet.photosystem(biochemistry) Either of two biochemical systems, active in chloroplasts, that are part of photosynthesisphraseogramA symbol that represents a phrase.phrenospasm(medicine, biology) A blow to the chest which causes the diaphragm to go into spasm, making it difficult to draw a breath.physicalism(philosophy) A philosophical position holding that everything which exists is no more extensive than its physical properties; that is, that there are no kinds of things other than physical things, which all are of logically procedural nature, based on fundamental laws at their deepest level of causality.physitheismThe ascription of physical form and attributes to a deity.pittosporumA plant of the genus Pittosporum, comprising various Old World shrubs and trees.pituitarism(medicine) Pituitary dysfunction.pivoxazepam(pharmacology) A benzodiazepine derivative, the pivalate ester of oxazepam, with sedative and anxiolytic effects.plaigiarismMisspelling of plagiarism.planariform(zoology) Resembling the planarians.planetariumA display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling.planidiformHaving the form of a planidiumplanuliform(zoology) Resembling a planula.platformism(anarchism) An anarchist tendency stressing the need for organizations that can influence working-class and peasant movements through ideological and tactical unity, collective responsibility, and federalism.playlistismThe practice of judging other people based on the contents of their music playlist.pleasuredomSynonym of pleasure.plebeianismThe quality or state of being plebeian.plebiscitum(Ancient Rome) A law enacted by the plebs, under the superintendence of a tribune or some subordinate plebeian magistrate, without the senate's intervention.pleinairism(art) The practice of painting outdoors, in the open.pleitropism(genetics) The quality of being pleitropic.pleochroism(biology) The presence of various colours in the cell wall.pleotropismAlternative form of pleiotropism.plumiliformHaving the shape of a plume or feather.pocilliform(biology, rare) In the shape of a small cup.podophyllumThe rhizome and rootlet of the May apple (Podophyllum peltatum), used as a cathartic drug.pointillism(art) The use of many small areas of color to construct an image.pollinarium(botany) The structure in an orchid flower which becomes attached to an insect during pollination. Includes the pollinia, caudicle, and viscidium.pollinodiumSynonym of antheridium.poltroonismSynonym of poltroonery.polyandrism(rare) polyandrypolyandriumA polyandrion.polyarchismThe practice of polyarchypolycratismThe system of polycracypolycrotism(physiology) That state or condition of the pulse in which the pulse curve, or sphygmogram, shows several secondary crests or elevations.polyglotismThe use, notably in speech, of several languages.polymastism(anatomy) The condition of having more than two mammæ, or breasts.polyorchismThe medical condition of having more than two testicles.polyphagismSynonym of polyphagy.polyphenism(genetics) The development of multiple, discrete phenotypes from a single genotype by organisms living in different environmental conditions.polystylismA polystylistic approach in art or music.polythelism(anatomy) polythelia (the condition of having more than two nipples)polytropismA form of polymorphism in which adjacent sheets of a crystal are inclined to one another.polyzoarium(zoology) A polyzoarypositronium(physics, chemistry) An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair with no nucleus.possibilism(philosophy, politics) The belief that possible things exist, as well as actual things.possibilium(philosophy) Something that is possiblepostcranium(paleontology) The portion of a vertebrate skeleton located caudal to the cranium (that is, in bipeds, inferior to it).postfascismA new form of fascism.postquantumAlternative form of post-quantum.postscenium(Ancient Rome, theater) The part of a theater behind the stage; the backstage area.postsymptomFollowing the onset of a symptompostuniform(metallurgy) Pertaining to the state where elongation is a function of the strainrate hardening exponent determined near maximum loadposturogramAn image produced by posturography.powerbottomAlternative form of power bottom.preacherdomThe realm or sphere of preachers.precibariumA canal formed by the union of the epipharynx and the hypopharynx, that links the food canal and the cibarial pump in some insectsprecingulumA small ridge that leads to a cingulum on a tooth.predatorism(biology) The characteristic of being a predator.prefeminismThe prefeminist era.preferendum(sciences) That which is preferred.preinoculumMaterial added before an inoculumpreneoplasmtissue that develops into a neoplasmprepiriformAlternative form of prepyriform.prepyriform(anatomy) Anterior to the pyriform cortex or sinusprimitivismThe state or quality of being primitive.princessdomThe jurisdiction, sovereignty, rank, or estate of a princess.principlismA system of ethics based on the four moral principles of autonomy, beneficence, nonmaleficence, and justice.privilegismA social system in which some people have privileges that others do not.proactivismSupport for activism.probabilism(philosophy) The doctrine that, in the absence of certainty, probability is the best criterion.probasidium(mycology) A basidium prior to meiosis.procerebrum(anatomy, dated) The prosencephalon.prochronismAn error in chronological order in which something is ascribed an earlier time than the actual one.procingulum(dentistry) The front part of the tooth, before the anterior murid.proconidium(mycology) The structure that develops into a conidiumproctodaeumAlternative spelling of proctodeum.prodigalismThe condition of being a spendthrift; profligacy.producerismA syncretic ideology of populist economic nationalism that holds that the productive forces of society — the ordinary worker, the small businessman, and the entrepreneur — are being held back by parasitical elements at the top and bottom of the social structure.profeminismSupport for feminism.proflazepam(pharmacology) A benzodiazepine drug.prognathismAn abnormal projection of the jaws.proletarismSynonym of proletarianism.promeristemThe part of a meristem that contains undifferentiated cellspromyceliumThe basidium of a rust fungus, a club-shaped structure bearing sporidiapronatalismAn attitude or ideology promoting child-bearing; advocacy of having children, especially from the State.proostracum(paleontology) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous.propagandumAn idea or topic spread with the goal of convincing or influencing large numbers of people, regardless of its actual validity.propatagiumThe portion of patagium stretching from the neck to the first digitproselytismThe practice of proselytizing.prosimetrumA poetic composition consisting of both prose and verse, usually in alternationprotagonismThe quality of being a protagonist.prothalliumA plant, usually a pteridophyte, in gametophyte stage in the metagenesis cycle.protologism(neologism) A newly coined word or phrase defined in the hope that it will become common; a recently created term possibly in narrow use but not yet acknowledged.protophloem(botany) The form of phloem that is initially formed, composed of narrow, thin-walled cells.protopodium(biology) A primitive footprotoracismAlternative form of proto-racism.proxenetism(formal) The negotiation or facilitation of a transaction between a sex worker and a customer.pseudovelumA velarium that resembles a velum.psychoplasmA supposed physical substance that is the basis of consciousness.pulmonariuma membranous pleurite between the abdominal tergites and sternites of some insectspulviniformpillow-shapedpupillogramThe graphical record obtained by pupillographypurposivism(philosophy, religion) philosophy, especially religious, that treats will or conscious intent as a basal factpustuliformHaving the shape of a pustulepylorospasmspasm of the pyloric muscle