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paedomorphismAlternative spelling of pedomorphism.paleoendemismThe condition of being paleoendemicpaleostriatumThe globus pallidus.panaesthetismThe theory that all matter is conscious.panchromatismQuality of being panchromatic.pancreatogramAn image produced by pancreatographypanpsychicismAlternative form of panpsychism.panspermatism(historical) The obsolete theory that germs are omnipresent.paphiopedilum(botany) Any plant of the genus Paphiopedilum.parabronchium(anatomy) parabronchusparagammacismInability to produce the sound /g/, gammacism.parallelogram(geometry) A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.paramagnetism(physics) The tendency of magnetic dipoles to align with an external magnetic field; materials that exhibit this tendency become temporary magnets.paramenstruumThe days immediately before and after menstruationparanormalismThe paranormal generally.paraphyletismThe condition of being paraphyleticpararhotacismInability to pronounce the letter R, rhotacism.parasexualismThe condition of being parasexualparasigmatismSynonym of sigmatism.parasitoidismparasitism by a parasitoidparasubiculumA retrohippocampal isocortical structure in the rodent brainparaterraformTo cover a sterile planet with a greenhouse-like transparent dome to allow for life and agriculture.particularismAn exclusive focus on a particular area, group, sect, etc.pathomorphism(pathology) A pathological abnormality of structure or appearancepedestrianismGoing on foot; walking.pegfilgrastimA PEGylated form of filgrastim.penicilliform(botany) penicillatepeninsularismProvincialism; parochiality.pennibrachium(zoology, paleontology) A forelimb, found on various species of extinct and extant coelurosaur, that is not used in flight or gliding but still bears long, typically pennaceous feathers which form a winglike surface.pentaaluminum(chemistry, in combination) pentaaluminium.pentaluminium(chemistry, in combination) pentaaluminium.pentatonicism(music) The condition of being pentatonicperceptionism(philosophy) The philosophy that reality is based on our sense of perceptionperceptroniumA hypothetical state of matter capable of giving rise to self-awareness and subjectivity.perfectionismAn unwillingness to settle for anything less than perfection.perforatorium(biology, dated) The acrosome.perichondrium(anatomy) a dense layer of fibrous connective tissue surrounding the cartilage of developing boneperipheralismA policy of focusing on what is peripheral.perisaturniumSynonym of perikrone.perspectivismThe philosophical view that all perception always takes place from a specific perspective.phalansterismA system of phalansteries; Fourierism.pharyngospasmpharyngismusphenomenalism(philosophy) The doctrine that physical objects exist only as perceptual phenomena or sensory stimuliphenyllithium(organic chemistry) An organometallic agent with the empirical formula C₆H₅Li.philhellenismA 19th-century intellectual movement which supported the independence of Greece from the Ottoman Empire.philosemitismAlternative form of philo-Semitism.phlogistonism(chemistry, historical) The phlogiston theory.phosphogypsum(inorganic chemistry) A form of gypsum (calcium sulfate) formed as a by-product in the manufacture of phosphate fertilizersphotochromismThe reversible transformation of the optical properties of a material when exposed to electromagnetic radiation, especially the reversible darkening of a plastic lens when exposed to sunlight.photogenicism(informal, very rare) The condition of being photogenic.phototelegram(archaic) A fax communication.phototrophism(botany) Alternative spelling of phototropism.phraseologism(linguistics) A fixed expression within a language, regarded as a phraseological unit.phyllocladium(botany) phyllocladephysiocratismThe ideology of the physiocratsphytomorphismTo use a plant-centric perspective.pickpocketismpickpocketingpiezochromism(physics) The relationship between the colour of a material and the applied pressurepiptazobactam(pharmacology) A combination antibiotic containing piperacillin, a beta-lactam antibiotic, and tazobactam, a beta-lactamase inhibitor.pivmecillinamAn orally active prodrug of mecillinam.plagiotropism(biology) The growth of a plant at an orientation to the angle of a stimulusplantigradismPlantigrade locomotion.platiniridium(chemistry, mineralogy) A natural alloy of platinum and iridium occurring in grayish metallic rounded or cubical grains with platinum.platygaeanism(rare) The belief that the Earth's shape is a plane or disk.pleiomorphismAlternative form of pleomorphism.plethysmogramA recording made by the plethysmograph.pleurocentrum(anatomy) One of the lateral elements in the centra of the vertebrae in some fish and fossil batrachians.pleurothetismA pattern of orientation among most bivalves whereby they come to rest on their left or right sides.pluripartyism(rare) Synonym of multipartyism.pneumotropismThe condition of being pneumotropicpococurantismIndifference, nonchalance.polyalgorithm(mathematics, computing) A set of algorithms together with rules for choosing when to use each one.polyamorphism(chemistry, physics) The existence of multiple amorphous forms of a substancepolydactylism(anatomy) The possession of more than the normal number of digits.polydaemonismAlternative form of polydemonism.polygoneutism(zoology) The state of being polygoneuticpolylogarithm(mathematics) A function of complex numbers related to logarithms.polymegethismAn abnormally large variation in size of the corneal endothelial cells.polynomialismThe use of many names or terms.polyorchidismThe medical condition of having more than two testicles.polypantheism(religion) Belief in multiple impersonal nontranscendent deities embodied by natural phenomena.polyphyletismThe property of being polyphyletic.polypteriformAny fish of the order PolypteriformespolysomnogramA record of a person's sleep activity obtained using polysomnography.polysyllabismPolysyllabicism.polysyllogism(logic) A number of propositions that, together, constitute a sequence of syllogismspopulationismThe idea that the power of a state depends upon the size of its populationporibacteriumA bacterium, of the proposed phylum Poribacteria, present in sea sponges of the phylum PorfirapossessionismThe tendency to expand one's ownership of property without regard for its ethical implications.postanarchismAn anarchist philosophy that employs poststructuralist and postmodernist approaches.postcommunismThe period of political and economic transformation or transition in former communist states located in parts of Europe and Asia, in which new governments aimed to create free market-oriented capitalist economies.posteroseptum(anatomy) The ostium of the coronary sinuspostformalismApplication of the postformal stage of cognitive development.postgenderismA sociopolitical and cultural movement which arose from the eroding of the cultural, biological, psychological, and social role of gender, and an argument for why the erosion of the gender binary will be liberatory.postmodernismAny style in art, architecture, literature, philosophy, etc., that reacts against an earlier modernist movement.postscutellum(zoology) The hindmost dorsal piece of a thoracic somite of an insect; the plate behind the scutellum.postsubiculum(neurology) The dorsal part of the presubiculum.praefericulumA tall vase with a handle, used in Ancient Roman sacrificespraeoperculumAlternative form of preoperculum.praeseodymiumAlternative spelling of praseodymium.prealcoholismThe period of an individual's life before the onset of alcoholism.preblastodermAlternative form of preblastodermic.precapitalismPrimitive systems of trade before the full development of capitalism.predicativism(philosophy, logic) A philosophical position that definitions of concepts can only use other concepts that don't depend on the concept being defined.preepisternumThe anterior part of an episternumprehaustoriumA structure formed between the root of a parasitic plant and its host that develops into a haustoriumpremolariformHaving the form of a premolarpreraphaelism(art) The doctrine or practice of a school of modern painters who profess to be followers of the painters before Raphael. Its adherents advocate careful study from nature, delicacy and minuteness of workmanship, and an exalted and delicate conception of the subject.preventionismA policy or approach based on trying to prevent something from happening.primordialismDevotion to, or persistence in, conditions of the primordial state.proceduralismA belief in the importance of using agreed procedures.processionism(Christianity) A theological subject of research, within Christian pneumatology, dealing with the procession of the Holy Spirit.processualismA methodological analysis of processes in the social sciencesproepicardiumAn embryonic group of progenitor cells that forms near the venous pole of the heart and gives rise to the epicardium.proepisternumThe episternum of the prothorax of an insectprogressivismA political ideology that favours progress towards better conditions in society.progymnosperm(biology) A very early form of plant that produced both wood (like trees) and spores (like ferns).projectionism(philosophy) The idea that individuals form an idea of the external world by projecting their own internal beliefs onto it.proslaveryismSynonym of proslavery (“support for the institution of slavery”).protectionismLinguistic purism.protoactiniumDated form of protactinium.protocerebrum(biology) The anterior part of the arthropod brain.protochronismThe pseudoscientific idea that Latin (or other languages) are descended from Romanian as opposed to vice versa.protofeminismA philosophical tradition anticipating modern feminist concepts before their arrival.protoorganism(biology) An organism whose nature is so difficult to determine that it might be referred to either the animal or the vegetable kingdom.prototrophism(microbiology) Reversion to the growth factor requirements of an ancestral strain.proverbialismA proverbial phrase, or the use of proverbs.provincialismThe quality of being provincial; having provincial tastes, mentality, manners.prudentialismThe policy or practice of being prudential.pseudisodomumAlternative form of pseudisodomon.pseudoproblemAlternative form of pseudo-problem.pseudorealismA dramatic or artistic technique in which an altered view of reality is presented as being real.pseudotheciumAn ascocarp resembling a perithecium but whose asci are not regularly organised into a hymenium and are bitunicate, having a double wall which expands when it takes up water and shoots the enclosed spores out suddenly to disperse them.psychomanteumA dark, mirrored room dedicated to communication with the spirit realm.psychotropismThe desire for or pursuit of altered states of consciousness.pterygopodium(anatomy) A modified part of the pelvic fin in male elasmobranchs, which serves as a copulatory organpyoperitoneum(medicine) An accumulation of pus in the peritoneal cavity.pyromagnetism(physics) The variation of magnetic field with temperature; the condition of becoming magnetic when heated.pyromechanismA mechanism operated by an explosionpyrrolidinium(organic chemistry) A cation formed by protonation of a pyrrolidine