| momentum | (noun) an impelling force or strength | Synonyms: impulse |
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| (noun) the product of a body's mass and its velocity | - |
| moratorium | (noun) suspension of an ongoing activity | - |
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| (noun) a legally authorized postponement before some obligation must be discharged | - |
| mum | (adjective) failing to speak or communicate etc when expected to | Synonyms: silent |
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| (noun) secrecy | - |
| (noun) informal terms for a mother | Synonyms: ma, mama, mamma, mammy, mom, momma, mommy, mumma, mummy |
| (noun) of China | Synonyms: Chrysanthemum morifolium, Dendranthema grandifloruom, florist's chrysanthemum, florists' chrysanthemum |
| museum | (noun) a depository for collecting and displaying objects having scientific or historical or artistic value | - |
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| mycelium | (noun) the vegetative part of a fungus consisting of a mass of branching threadlike hyphae | - |
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| mycobacterium | (noun) rod-shaped bacteria some saprophytic or causing diseases | Synonyms: mycobacteria |
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| myocardium | (noun) the middle muscular layer of the heart wall | - |
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| myometrium | (noun) the smooth muscle forming the wall of the uterus | - |
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| myxobacterium | (noun) bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste | Synonyms: gliding bacteria, myxobacter, myxobacteria, slime bacteria |
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| nasturtium | (noun) flowers and seeds and leaves all used as flavorings | - |
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| (noun) any tropical American plant of the genus Tropaeolum having pungent juice and long-spurred yellow to red flowers | - |
| natatorium | (noun) pool that provides a facility for swimming | Synonyms: swimming bath, swimming pool |
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| neodymium | (noun) a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium | Synonyms: atomic number 60, Nd |
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| neopallium | (noun) the cortical part of the neencephalon | Synonyms: neocortex |
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| neptunium | (noun) a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium | Synonyms: atomic number 93, Np |
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| neuroepithelium | (noun) epithelium associated with special sense organs and containing sensory nerve endings | - |
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| ngultrum | (noun) the basic unit of money in Bhutan | - |
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| niobium | (noun) a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium | Synonyms: atomic number 41, Nb |
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| nitrobacterium | (noun) any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates | - |
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| nobelium | (noun) a radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known | Synonyms: atomic number 102, No |
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| nostrum | (noun) patent medicine whose efficacy is questionable | - |
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| (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: catholicon, cure-all, panacea |
| oakum | (noun) loose hemp or jute fiber obtained by unravelling old ropes; when impregnated with tar it was used to caulk seams and pack joints in wooden ships | - |
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| odium | (noun) hate coupled with disgust | Synonyms: abhorrence, abomination, detestation, execration, loathing |
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| (noun) state of disgrace resulting from detestable behavior | - |
| odontoglossum | (noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
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| olibanum | (noun) an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation | Synonyms: frankincense, gum olibanum, thus |
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| omasum | (noun) the third compartment of the stomach of a ruminant | Synonyms: psalterium, third stomach |
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| omentum | (noun) a fold of peritoneum supporting the viscera | - |
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| ommatidium | (noun) any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods | - |
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| oncidium | (noun) any orchid of the genus Oncidium: characterized by slender branching sprays of small yellow and brown flowers; often grown as houseplants | Synonyms: butterfly orchid, butterfly plant, dancing lady orchid |
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| operculum | (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted | - |
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| opium | (noun) an addictive narcotic extracted from seed capsules of the opium poppy | - |
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| opossum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: possum |
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| (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: phalanger, possum |
| opprobrium | (noun) a state of extreme dishonor | Synonyms: infamy |
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| (noun) state of disgrace resulting from public abuse | Synonyms: obloquy |
| optimum | (adjective) most desirable possible under a restriction expressed or implied | Synonyms: optimal |
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| (noun) most favorable conditions or greatest degree or amount possible under given circumstances | - |
| origanum | (noun) any of various fragrant aromatic herbs of the genus Origanum used as seasonings | - |
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| osmiridium | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: iridosmine |
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| osmium | (noun) a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known | Synonyms: atomic number 76, Os |
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| ossiculum | (noun) a small bone; especially one in the middle ear | Synonyms: bonelet, ossicle |
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| ostensorium | (noun) (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration | Synonyms: monstrance |
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| ovum | (noun) the female reproductive cell; the female gamete | Synonyms: egg cell |
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| pablum | (noun) worthless or oversimplified ideas | Synonyms: pap |
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| pabulum | (noun) insipid intellectual nourishment | - |
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| (noun) any substance that can be used as food | Synonyms: comestible, eatable, edible, victual, victuals |
| paleocerebellum | (noun) the anterior lobe of the cerebellum which was one of the earliest parts of the hindbrain to develop in mammals | - |
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| paleostriatum | (noun) the inner pale yellow part of the lenticular nucleus | Synonyms: globus pallidus, pallidum |
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| palladium | (noun) a silver-white metallic element of the platinum group that resembles platinum; occurs in some copper and nickel ores; does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry | Synonyms: atomic number 46, Pd |
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| pallidum | (noun) the inner pale yellow part of the lenticular nucleus | Synonyms: globus pallidus, paleostriatum |
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| pallium | (noun) cloak or mantle worn by men in ancient Rome | - |
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| (noun) (Roman Catholic Church) vestment consisting of a band encircling the shoulders with two lappets hanging in front and back | - |
| (noun) (zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell | Synonyms: mantle |
| (noun) the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum | Synonyms: cerebral cortex, cerebral mantle, cortex |
| pandemonium | (noun) a state of extreme confusion and disorder | Synonyms: bedlam, chaos, topsy-turvydom, topsy-turvyness |
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| panjandrum | (noun) an important or influential (and often overbearing) person | Synonyms: dignitary, high-up, high muckamuck, very important person, VIP |
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| paramecium | (noun) any member of the genus Paramecium | Synonyms: paramecia |
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| parapodium | (noun) one of a pair of fleshy appendages of a polychete annelid that functions in locomotion and breathing | - |
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| paspalum | (noun) tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States | Synonyms: dallis grass, dallisgrass, Paspalum dilatatum |
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| pendulum | (noun) an apparatus consisting of an object mounted so that it swings freely under the influence of gravity | - |
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| penetralium | (noun) the innermost parts | - |
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| peplum | (noun) a flared ruffle attached to the waistline of a dress or jacket or blouse | - |
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| (noun) a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist | Synonyms: peplos, peplus |
| pericardium | (noun) a serous membrane with two layers that surrounds the heart | - |
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| peridium | (noun) outer layer of the spore-bearing organ in many fungi | - |
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| perigonium | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigone |
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| perimysium | (noun) the sheath of connective tissue that covers a bundle of muscle fibers | - |
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| perineum | (noun) the general region between the anus and the genital organs | - |
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| perineurium | (noun) the sheath of connective tissue that covers a bundle of nerve fibers | - |
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| periosteum | (noun) a dense fibrous membrane covering the surface of bones (except at their extremities) and serving as an attachment for tendons and muscles; contains nerves and blood vessels that nourish the enclosed bone | - |
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| perithecium | (noun) flask-shaped ascocarp | - |
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| perithelium | (noun) tissue layer around small blood vessels | - |
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| peritoneum | (noun) a transparent membrane that lines the abdominal cavity in mammals and covers most of the viscera | - |
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| pessimum | (adjective) of an organism's environment; least favorable for survival | Synonyms: pessimal |
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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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| phoenicophorium | (noun) latanier palm | Synonyms: genus Phoenicophorium |
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| phylum | (noun) (biology) the major taxonomic group of animals and plants; contains classes | - |
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| (noun) (linguistics) a large group of languages that are historically related | - |
| pinetum | (noun) an area planted with pine trees or related conifers | - |
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| planetarium | (noun) an apparatus or model for representing the solar systems | - |
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| (noun) an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome | - |
| (noun) a building housing an instrument for projecting the positions of the planets onto a domed ceiling | - |
| plasmodium | (noun) parasitic protozoan of the genus Plasmodium that causes malaria in humans | Synonyms: malaria parasite, Plasmodium vivax |
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| (noun) multinucleate sheet of cytoplasm characteristic of some stages of such organisms as slime molds | - |
| platinum | (noun) a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits | Synonyms: atomic number 78, Pt |
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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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| plenum | (noun) an enclosed space in which the air pressure is higher than outside | - |
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| (noun) a meeting of a legislative body at which all members are present | - |
| plum | (noun) a highly desirable position or assignment | - |
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| (noun) any of numerous varieties of small to medium-sized round or oval fruit having a smooth skin and a single pit | - |
| (noun) any of several trees producing edible oval fruit having a smooth skin and a single hard stone | Synonyms: plum tree |
| (adverb) exactly | Synonyms: plumb |
| (adverb) completely; used as intensifiers | Synonyms: clean, plumb |
| plutonium | (noun) a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239 | Synonyms: atomic number 94, Pu |
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| podetium | (noun) an organ or body resembling a stalk; especially the outgrowth of the thallus of certain lichens on which the ascocarp is borne | - |
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| podium | (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, pulpit, rostrum, soapbox, stump |
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| polemonium | (noun) any plant of the genus Polemonium; most are low-growing often foul-smelling plants of temperate to Arctic regions | - |
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| 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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| pomatum | (noun) hairdressing consisting of a perfumed oil or ointment | Synonyms: pomade |
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| possum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: opossum |
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| (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: opossum, phalanger |
| postpartum | (adjective) occurring immediately after birth | Synonyms: postnatal |
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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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