| pollinium | (noun) a coherent mass of pollen grains (as in orchids) | - |
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| polonium | (noun) a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor | Synonyms: atomic number 84, Po |
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| potassium | (noun) a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite | Synonyms: atomic number 19, K |
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| praesidium | (noun) a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session | Synonyms: presidium |
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| praetorium | (noun) the tent of an ancient Roman general | Synonyms: pretorium |
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| praseodymium | (noun) a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process | Synonyms: atomic number 59, Pr |
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| precordium | (noun) the external surface of the body overlying the heart and stomach | - |
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| premium | (adjective) having or reflecting superior quality or value; having a higher price or cost | - |
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| (noun) the amount that something in scarce supply is valued above its nominal value | - |
| (noun) payment or reward (especially from a government) for acts such as catching criminals or killing predatory animals or enlisting in the military | Synonyms: bounty |
| (noun) payment for insurance | Synonyms: insurance premium |
| (noun) a fee charged for exchanging currencies | Synonyms: agio, agiotage, exchange premium |
| (noun) a prize, bonus, or award given as an inducement to purchase products, enter competitions initiated by business interests, etc. | - |
| presidium | (noun) a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session | Synonyms: praesidium |
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| pretorium | (noun) the tent of an ancient Roman general | Synonyms: praetorium |
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| primordium | (noun) an organ in its earliest stage of development; the foundation for subsequent development | Synonyms: anlage |
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| promethium | (noun) a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium | Synonyms: atomic number 61, Pm |
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| promycelium | (noun) the basidium of various fungi | - |
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| promythium | (noun) A section of text that comes before the story. | - |
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| proscenium | (noun) the wall that separates the stage from the auditorium in a modern theater | Synonyms: proscenium wall |
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| (noun) the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain) | Synonyms: apron, forestage |
| protactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protoactinium |
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| prothalamium | (noun) a song in celebration of a marriage | Synonyms: prothalamion |
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| protoactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protactinium |
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| psalterium | (noun) the third compartment of the stomach of a ruminant | Synonyms: omasum, third stomach |
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| pseudopodium | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopod |
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| psyllium | (noun) plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative | Synonyms: fleawort, Plantago psyllium, Spanish psyllium |
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| pterygium | (noun) either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea; it arises from irritation of the pinguecula | - |
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| puerperium | (noun) time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved | - |
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| purificatorium | (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. | Synonyms: emunctorium, purificator |
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| pycnidium | (noun) flask-shaped asexual structure containing conidia | - |
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| pythium | (noun) any fungus of the genus Pythium | - |
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| pyxidium | (noun) fruit of such plants as the plantain; a capsule whose upper part falls off when the seeds are released | Synonyms: pyxis |
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| quadrennium | (noun) a period of four years | - |
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| quadrivium | (noun) (Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy | - |
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| quinquennium | (noun) a period of five years | - |
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| radiothorium | (noun) radioactive isotope of thorium with mass number 228 | Synonyms: thorium-228 |
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| radium | (noun) an intensely radioactive metallic element that occurs in minute amounts in uranium ores | Synonyms: atomic number 88, Ra |
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| regnellidium | (noun) small latex-containing aquatic fern of southern Brazil | Synonyms: Regnellidium diphyllum |
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| rhenium | (noun) a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum | Synonyms: atomic number 75, Re |
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| rhodium | (noun) a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum | Synonyms: atomic number 45, Rh |
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| roentgenium | (noun) a radioactive transuranic element, with atomic number 111 | Synonyms: atomic number 111, element 111, Rg |
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| rubidium | (noun) a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite | Synonyms: atomic number 37, Rb |
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| ruthenium | (noun) a rare polyvalent metallic element of the platinum group; it is found associated with platinum | Synonyms: atomic number 44, Ru |
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| rutherfordium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq |
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| samarium | (noun) a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite | Synonyms: atomic number 62, Sm |
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| sanatarium | (noun) a hospital for recuperation or for the treatment of chronic diseases | Synonyms: sanatorium, sanitarium |
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| sanatorium | (noun) a hospital for recuperation or for the treatment of chronic diseases | Synonyms: sanatarium, sanitarium |
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| (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, madhouse, nut house, nuthouse, snake pit |
| sanitarium | (noun) a hospital for recuperation or for the treatment of chronic diseases | Synonyms: sanatarium, sanatorium |
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| scandium | (noun) a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite | Synonyms: atomic number 21, Sc |
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| scholium | (noun) a marginal note written by a scholiast (a commentator on ancient or classical literature) | Synonyms: scholia |
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| sclerotium | (noun) compact usually dark-colored mass of hardened mycelium constituting a vegetative food-storage body in various true fungi; detaches when mature and can give rise to new growth | - |
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| scolopendrium | (noun) a fern thought to resemble a millipede | - |
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| scriptorium | (noun) a room in a monastery that is set aside for writing or copying manuscripts | - |
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| seaborgium | (noun) a transuranic element with atomic number 106 | Synonyms: atomic number 106, element 106, Sg |
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| selenium | (noun) a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite) | Synonyms: atomic number 34, Se |
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| sensorium | (noun) the areas of the brain that process and register incoming sensory information and make possible the conscious awareness of the world | - |
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| sericterium | (noun) silk-producing gland of insects (especially of a silkworm) or spiders | Synonyms: serictery, silk gland |
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| sodium | (noun) a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt) | Synonyms: atomic number 11, Na |
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| solarium | (noun) a room enclosed largely with glass and affording exposure to the sun | Synonyms: sun lounge, sun parlor, sun parlour, sun porch, sunporch, sunroom |
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| sporangium | (noun) organ containing or producing spores | Synonyms: spore case, spore sac |
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| stadium | (noun) a large structure for open-air sports or entertainments | Synonyms: arena, bowl, sports stadium |
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| strontium | (noun) a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite | Synonyms: atomic number 38, Sr |
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| stylopodium | (noun) an enlargement at the base of the style in some Umbelliferae | - |
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| sudatorium | (noun) a bathhouse for hot air baths or steam baths | Synonyms: sudatory |
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| supercilium | (noun) the arch of hair above each eye | Synonyms: brow, eyebrow |
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| syconium | (noun) the fleshy multiple fruit of the fig consisting of an enlarged hollow receptacle containing numerous fruitlets | - |
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| symposium | (noun) a meeting or conference for the public discussion of some topic especially one in which the participants form an audience and make presentations | - |
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| syncytium | (noun) a mass of cytoplasm containing several nuclei and enclosed in a membrane but no internal cell boundaries (as in muscle fibers) | - |
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| synovium | (noun) a thin membrane in synovial (freely moving) joints that lines the joint capsule and secretes synovial fluid | Synonyms: synovial membrane |
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| technetium | (noun) a crystalline metallic element not found in nature; occurs as one of the fission products of uranium | Synonyms: atomic number 43, Tc |
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| tedium | (noun) dullness owing to length or slowness | Synonyms: tediousness, tiresomeness |
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| (noun) the feeling of being bored by something tedious | Synonyms: boredom, ennui |
| tellurium | (noun) a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold | Synonyms: atomic number 52, Te |
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| tentorium | (noun) (anatomy) a fold of dura mater that covers the cerebellum and supports the occipital lobes of the cerebrum | - |
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| terbium | (noun) a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite | Synonyms: atomic number 65, Tb |
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| terrarium | (noun) a vivarium in which selected living plants are kept and observed | - |
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| tetrasporangium | (noun) a sporangium containing four asexual spores | - |
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| thallium | (noun) a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores | Synonyms: atomic number 81, Tl |
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| thorium | (noun) a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands | Synonyms: atomic number 90, Th |
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| thulium | (noun) a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime | Synonyms: atomic number 69, Tm |
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| titanium | (noun) a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite | Synonyms: atomic number 22, Ti |
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| trapezium | (noun) the wrist bone on the thumb side of the hand that articulates with the 1st and 2nd metacarpals | Synonyms: os trapezium, trapezium bone |
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| (noun) a quadrilateral with no parallel sides | - |
| trichodesmium | (noun) large colonial bacterium common in tropical open-ocean waters; important in carbon and nitrogen fixation | - |
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| triclinium | (noun) a dining table with couches along three sides in ancient Rome | - |
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| (noun) a dining room (especially a dining room containing a dining table with couches along three sides) | - |
| trillium | (noun) any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower | Synonyms: wake-robin, wood lily |
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| tritium | (noun) a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms | - |
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| trivium | (noun) (Middle Ages) an introductory curriculum at a medieval university involving grammar and logic and rhetoric; considered to be a triple way to eloquence | - |
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| unnilquadium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, rutherfordium, Unq |
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| ununbium | (noun) a radioactive transuranic element, with atomic number 112 | Synonyms: atomic number 112, element 112, Uub |
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| ununhexium | (noun) a radioactive transuranic element, with atomic number 116 | Synonyms: atomic number 116, element 116, Uuh |
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| ununpentium | (noun) a radioactive transuranic element, with atomic number 115 | Synonyms: atomic number 115, element 115, Uup |
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| ununquadium | (noun) a radioactive transuranic element, with atomic number 114 | Synonyms: atomic number 114, element 114, Uuq |
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| ununtrium | (noun) a radioactive transuranic element, with atomic number 113 | Synonyms: atomic number 113, element 113, Uut |
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| uranium | (noun) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons | Synonyms: atomic number 92, U |
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| uropygium | (noun) posterior part of a bird's body from which the tail feathers grow | - |
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| vanadium | (noun) a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite | Synonyms: atomic number 23, V |
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| verticillium | (noun) a fungus of the genus Verticillium | - |
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| vitellarium | (noun) A modified part of the ovary that in many flatworms and rotifers produces yolk-filled cells serving to nourish the true eggs. | - |
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| vivarium | (noun) an indoor enclosure for keeping and raising living animals and plants and observing them under natural conditions | - |
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| ytterbium | (noun) a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime | Synonyms: atomic number 70, Yb |
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| yttrium | (noun) a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys | Synonyms: atomic number 39, Y |
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| zirconium | (noun) a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon | Synonyms: atomic number 40, Zr |
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| zoarium | (noun) a colony of zooids. | - |
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