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palaeoendemismAlternative form of paleoendemism.paleoecosystemAn ancient ecosystempaleomagnetism(geology) The study of the strength and direction of the Earth's magnetic field as it has changed over geologic time.paleonisciformAlternative form of palaeonisciform.paleovolcanismprehistoric volcanismpancognitivismThe belief that all matter possesses or is capable of cognition in some form.pandiatonicism(music) pandiatonic compositionpanromanticism(neologism) The state of being panromantic, i.e. romantically attracted to people regardless of genders.paracharmonium(particle physics) The form of charmonium in which the spins of the two quarks align oppositely.parachromatismPartial colour blindness (a mild defect in colour vision)paragrammatismThe confused or incomplete use of grammatical structures, found in certain forms of speech disturbance.parajournalismThe deceptive use of journalistic style and presentation to publish falsehoods.paralambdacismInability to pronounce the letter L, lambdacism.paramilitarismThe use of a paramilitary force.paraperigonium(botany) An anomalous secondary outgrowth of the perianthal meristem with ramifying vasculature.paraquarkonium(particle physics) An antiparallel form of orthoquarkonium.parathyroidism(pathology) disease of the parathyroid glandspathomechanism(pathology) pathological mechanism; the mechanism by which a pathological condition occurspatriarchalismThe quality of being patriarchal.patrilinealismThe patrilineal system.patrimonialismA political system in which all power flows from the leader.patrocladogram(genetics) A patristic cladogram.pectobacteriumAny bacterium of the genus PectobacteriumpectoriloquismpectoriloquypegbovigrastimA recombinant form of a material that stimulates the production of granulocytes (in cows)pentaaluminium(chemistry, in combination) Five atoms of aluminium in a chemical compound.pentadactylismpentadactylypentamagnesium(chemistry, especially in combination) Five magnesium atoms in a molecule.pentapalladium(chemistry, in combination) Five palladium atoms or ions in a compound (Pd₅).pentapotassium(inorganic chemistry, in combination) Five potassium ions in a compoundpentastrontium(chemistry, in combination) Five strontium atoms or ions in a compound (Sr₅).perfectibilism(philosophy) Perfectionism.performativismSynonym of performativity.perigalacticum(astronomy) The closest point in a star's orbit around the centre of a galaxy (the galactic periapsis).peripateticismThe doctrines or philosophical system of the peripateticspescatarianismAlternative form of pescetarianism.pescetarianismA dietary choice in which a person, known as a pescetarian, eats any combination of vegetables, fruit, nuts, beans and fish or seafood, but not mammals or birds. Some animal products, such as eggs and dairy, may or may not be part of the diet.phalangeriformAny marsupial of the suborder Phalangeriformesphallocentrism(literally) Focus on the phallus.philanthropismSynonym of philanthropy.phonovibrogramA vibrogram produced by phonovibrographyphosphoisoform(biochemistry) The isoform of a phosphoproteinphotobacteriumAny of the genus Photobacterium of bioluminescent bacteria.photodichroism(physics) photoinduced dichroism or birefringencephotoisomerism(chemistry, physics) isomerism (interconversion of isomers) as a result of irradiation by lightphotomagnetismThe branch of science that deals with the relation of magnetism to light, or the effect in which a material acquires or loses its ferromagnetic properties in response to light.photomicrogramSynonym of photomicrograph.photoperiodism(biology) The growth, development and other responses of plants and animals according to the length of day and/or night.photoradiogramAn image produced by photoradiography.phototransformTo cause, or to undergo a phototransformationphyllopodiform(zoology) Resembling the Phyllopoda.phytobacteriumA bacterium that lives in or on a plant.piezomagnetismMagnetism induced by applied mechanical stress.plagiopatagiumThe portion of patagium stretching from the last digit to the hind limbs.plesiadapiform(zoology) Any extinct mammal of the order Plesiadapiformesplesiomorphismplesiomorphypluripartidism(politics) A multiparty systempococuranteismAlternative form of pococurantism.pollotarianismA pollotarian diet.poltergeistismThe supposed manifestation of the presence of one or more poltergeists, especially as involving physical objects which move or fly about without warning.polyandrianism(obsolete) polyandrypolychromatismThe condition of being polychromaticpolycistronismThe condition of being polycistronicpolyglacialism(geology) The polyglacial theorypolylingualismMultilingualism.polyparasitismThe presence of multiple parasites on the same hostpolyphalangismThe condition of being polyphalange; having supernumerary phalanges in a digit.polypragmatism(medicine) The approach of trying various possible therapeutic treatments with no clear diagnostic guide.polyquaternium(chemistry) Any of a several classes of polymers having quaternary ammonium functional groups; they act as surfactants in shampoos and various hair productspolysporangium(botany) A sporangium that contains many sporespolysynthesismThe use of polysynthetic grammar.polysynthetismSynonym of polysynthesis.polytraumatisminjury as a result of polytraumaporoelastogramAn image produced by poroelastographypostcaniniformHaving the form of a postcanine toothpostcapitalismAny hypothetical economic system proposed as a future replacement for capitalism.postempiricismpostpositivismpostgadolinium(medicine) Describing imaging effects observed following administration of gadoliniumpostmillenniumAfter the turn of the millennium.postminimalismAny of various artistic movements that seek to move beyond the restrictions of minimalismpostmoratoriumFollowing a moratoriumpostpositivism(philosophy) A metatheoretical stance that critiques and amends positivism, saying that theories, background, knowledge and values of the researcher can influence what is observed and that human knowledge is based upon human conjectures.praseodidymiumObsolete form of praseodymium.precolonialismThe era or situation before colonialism.predeterminismThe belief that all events that occur have already been determined.preequilibriumBefore equilibriumpreexistentism(philosophy) The theory that souls exist prior to their association with human bodies.preparationism(theology) The view, in Christianity, that unregenerate people can take steps (such as praying, or reading the Bible) in preparation for conversion, and should be exhorted to do so.prescriptivism(linguistics) The practice of prescribing idealistic norms, as opposed to describing realistic forms, of linguistic usage.proabortionismAlternative spelling of pro-abortionism.probabiliorism(religion, philosophy) The belief that man is fated to do what is almost certainly correct.probasisternumThe basisternum of the prothorax of some insectsproblematicism(philosophy) A branch of philosophy that considers existence to be a constant evaluation of problemsproboscidiform(archaic) probosciform (having the form or uses of a proboscis)procelariiformMisspelling of procellariiform.procellariformAny seabird of the order Procellariiformesprogametangium(mycology) The structure, in some fungi, that develops into the gametangium.prohibitionism(law) The doctrine that people will refrain from certain actions if they are deemed unlawful (prohibited)proletarianism(uncountable) The political character and practice of the proletariat; advocacy or advancement of the proletariat’s interests.proletariatismSynonym of proletarianism.promotionalismThe policy of promoting something.propylammonium(organic chemistry) The cation formed by protonation of propylamine; any of its derivativesprotocuneiformBeing or relating to an early system of Sumerian writing that developed into cuneiform.protofeudalism(historical) Any social system preceding, and moving toward, later feudalism.protomartyrdomThe martyrdom of a protomartyr.protomodernismA protomodern style.provocationism(very rare) A policy of agitation.pseudoalbinismA defect in the pigmentation of animalspseudoallelism(genetics) The situation in which two genes with similar functions are located so close to one another on a chromosome that they are genetically linked and tend to be inherited togetherpseudoaneurysm(medicine) A so-called "false aneurysm", a hematoma that forms as the result of a leaking hole in an artery.pseudoarchaism(uncountable) The quality of being pseudo-archaic.pseudoconopeumA hyaline flap of silica forming a cavity on the external valve face of a marine diatompseudofeminismA belief system that resembles, but is not in fact, feminism.pseudomomentum(physics) The property of a wave, analogous to momentum, that determines the force exerted by the wave when it interacts with matterpseudomorphism(crystallography) The state of having, or the property of taking, a crystalline form unlike that of the species.pseudomycelium(biology) An association of cells, in some bacteria and yeast, that resembles a myceliumpseudoperidiumA membranous layer that surrounds the aeciospores in rust fungi.pseudopopulismFalse populism.pseudospectrum(mathematics) A set containing the spectrum of an operator and the numbers that are "almost" eigenvalues.pseudotympanum(zoology) A translucent, triangular area behind the opercle of some fish (supposed to function in hearing).psilanthropismpsilanthropypsychocentrismThe quality of being psychocentric.psychovitalism(dated) The belief that the mind is influenced by a basic vital force.punctuationism(politics) In evolutionary biology, belief that evolution does not proceed at a steady pace, but instead is characterized by periods of stasis, punctuated by brief (within several hundred-thousand years) periods of rapid change.pycnodontiformAny extinct bony fish of the order †Pycnodontiformes.