| microbiologist | (noun) a specialist in microbiology | - |
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| microbiology | (noun) the branch of biology that studies microorganisms and their effects on humans | - |
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| minibike | (noun) small motorcycle with a low frame and small wheels and elevated handlebars | Synonyms: motorbike |
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| miserabilism | (noun) mid-20th century French art movement. | - |
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| mobile | (noun) sculpture suspended in midair whose delicately balanced parts can be set in motion by air currents | - |
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| mobilisation | (noun) act of marshaling and organizing and making ready for use or action | Synonyms: mobilization |
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| (noun) act of assembling and putting into readiness for war or other emergency: | Synonyms: militarisation, militarization, mobilization |
| mobility | (noun) the quality of moving freely | - |
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| mobilization | (noun) act of marshaling and organizing and making ready for use or action | Synonyms: mobilisation |
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| (noun) act of assembling and putting into readiness for war or other emergency: | Synonyms: militarisation, militarization, mobilisation |
| mockingbird | (noun) long-tailed grey-and-white songbird of the southern United States able to mimic songs of other birds | Synonyms: Mimus polyglotktos, mocker |
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| mombin | (noun) purplish tropical fruit | - |
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| (noun) common tropical American shrub or small tree with purplish fruit | Synonyms: jocote, mombin tree, Spondias purpurea |
| moorbird | (noun) reddish-brown grouse of upland moors of Great Britain | Synonyms: Lagopus scoticus, moor-bird, moorfowl, moorgame, red grouse |
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| morbidity | (noun) the quality of being unhealthful and generally bad for you | Synonyms: morbidness, unwholesomeness |
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| (noun) an abnormally gloomy or unhealthy state of mind | Synonyms: morbidness |
| (noun) the relative incidence of a particular disease | - |
| morbidness | (noun) the quality of being unhealthful and generally bad for you | Synonyms: morbidity, unwholesomeness |
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| (noun) an abnormally gloomy or unhealthy state of mind | Synonyms: morbidity |
| morbilli | (noun) an acute and highly contagious viral disease marked by distinct red spots followed by a rash; occurs primarily in children | Synonyms: measles, rubeola |
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| motorbike | (noun) small motorcycle with a low frame and small wheels and elevated handlebars | Synonyms: minibike |
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| movability | (noun) the quality of being movable; capable of being moved or rearranged | Synonyms: movableness |
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| musophobia | (noun) a morbid fear of mice | - |
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| mutability | (noun) the quality of being capable of mutation | Synonyms: mutableness |
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| myoglobin | (noun) a hemoprotein that receives oxygen from hemoglobin and stores it in the tissues until needed | - |
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| myoglobinuria | (noun) the presence of myoglobin in the urine | - |
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| mysophobia | (noun) a morbid fear of dirt or contamination | - |
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| navigability | (noun) the quality of being suitable for the passage of a ship or aircraft | - |
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| nebbish | (noun) (Yiddish) a timid unfortunate simpleton | Synonyms: nebbech |
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| necrobiosis | (noun) (physiology) the normal degeneration and death of living cells (as in various epithelial cells) | Synonyms: cell death |
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| neophobia | (noun) a morbid fear of novelty | - |
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| neurobiologist | (noun) a specialist in neurobiology | - |
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| neurobiology | (noun) the branch of biology that deals with the anatomy and physiology and pathology of the nervous system | - |
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| newbie | (noun) any new participant in some activity | Synonyms: entrant, fledgeling, fledgling, freshman, neophyte, newcomer, starter |
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| nightbird | (noun) a person who likes to be active late at night | Synonyms: night owl, nighthawk |
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| niobite | (noun) a black mineral that is an ore of niobium and tantalum | Synonyms: columbite |
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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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| niqaabi | (noun) an observant Muslim woman who covers her face and hands when in public or in the presence of any man outside her immediate family | - |
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| nobility | (noun) the quality of elevation of mind and exaltation of character or ideals or conduct | Synonyms: grandeur, magnanimousness, nobleness |
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| (noun) a privileged class holding hereditary titles | Synonyms: aristocracy |
| (noun) the state of being of noble birth | Synonyms: noblesse |
| notability | (noun) a celebrity who is an inspiration to others | Synonyms: guiding light, leading light, luminary, notable |
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| noticeability | (noun) the property of being easy to see and understand | Synonyms: noticeableness, obviousness, patency |
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| novobiocin | (noun) an antibiotic obtained from an actinomycete and used to treat infections by Gram-positive bacteria | - |
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| nubbin | (noun) a small nub (especially an undeveloped fruit or ear of corn) | - |
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| nubbiness | (noun) looseness or roughness in texture (as of cloth) | Synonyms: coarseness, tweediness |
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| nyctophobia | (noun) a morbid fear of night or darkness | - |
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| obi | (noun) a religious belief of African origin involving witchcraft and sorcery; practiced in parts of the West Indies and tropical Americas | Synonyms: obeah |
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| (noun) (West Indies) followers of a religious system involving witchcraft and sorcery | Synonyms: obeah |
| obiism | (noun) belief in a kind of sorcery that originated in Africa and is practiced in the West Indies | - |
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| obit | (noun) a notice of someone's death; usually includes a short biography | Synonyms: necrology, obituary |
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| obituary | (noun) a notice of someone's death; usually includes a short biography | Synonyms: necrology, obit |
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| oilbird | (noun) nocturnal fruit-eating bird of South America that has fatty young yielding an oil that is used instead of butter | Synonyms: guacharo, Steatornis caripensis |
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| openbill | (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip | - |
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| orbit | (noun) an area in which something acts or operates or has power or control: | Synonyms: ambit, compass, range, reach, scope |
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| (noun) the bony cavity in the skull containing the eyeball | Synonyms: cranial orbit, eye socket, orbital cavity |
| (noun) the (usually elliptical) path described by one celestial body in its revolution about another | Synonyms: celestial orbit |
| (noun) the path of an electron around the nucleus of an atom | Synonyms: electron orbit |
| (noun) a particular environment or walk of life | Synonyms: area, arena, domain, field, sphere |
| orbitale | (noun) the craniometric point at the lowest point on the lower edge of the orbit | Synonyms: orbital point |
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| orbiter | (noun) man-made equipment that orbits around the earth or the moon | Synonyms: artificial satellite, satellite |
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| ostensibility | (noun) The quality of being professed, supposed rather than demonstrably true or real. | - |
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| ovenbird | (noun) American warbler; builds a dome-shaped nest on the ground | Synonyms: Seiurus aurocapillus |
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| (noun) small brownish South American birds that build oven-shaped clay nests | - |
| overbid | (noun) a bid that is higher than preceding bids | - |
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| (noun) (bridge) a bid that is higher than your opponent's bid (especially when your partner has not bid at all and your bid exceeds the value of your hand) | Synonyms: overcall |
| overbite | (noun) (dentistry) malocclusion in which the upper teeth extend abnormally far over the lower teeth | - |
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| oxyhaemoglobin | (noun) the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs | Synonyms: oxyhemoglobin |
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| oxyhemoglobin | (noun) the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs | Synonyms: oxyhaemoglobin |
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| palaeobiology | (noun) a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms | Synonyms: paleobiology |
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| palatability | (noun) the property of being acceptable to the mouth | Synonyms: palatableness |
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| (noun) acceptability to the mind or feelings | Synonyms: palatableness |
| paleobiology | (noun) a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms | Synonyms: palaeobiology |
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| palpability | (noun) the quality of being perceivable by touch | Synonyms: tangibility, tangibleness |
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| pebibit | (noun) a unit of information equal to 1024 tebibits or 2^50 bits | Synonyms: Pibit |
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| pebibyte | (noun) a unit of information equal to 1024 tebibytes or 2^50 bytes | Synonyms: PB, petabyte, PiB |
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| penetrability | (noun) the quality of being penetrable (by people or light or missiles etc.) | Synonyms: perviousness |
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| pentobarbital | (noun) a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic | Synonyms: Nembutal, pentobarbital sodium, yellow jacket |
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| perceptibility | (noun) the property of being perceptible by the mind or the senses | - |
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| perdurability | (noun) the property of being extremely durable | - |
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| perfectibility | (noun) the capability of becoming perfect | - |
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| perishability | (noun) unsatisfactoriness by virtue of being subject to decay or spoilage or destruction | Synonyms: perishableness |
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| permeability | (noun) the property of something that can be pervaded by a liquid (as by osmosis or diffusion) | Synonyms: permeableness |
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| permissibility | (noun) admissibility as a consequence of being permitted | - |
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| permutability | (noun) ability to change sequence | Synonyms: permutableness, transposability |
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| petabit | (noun) a unit of information equal to 1000 terabits or 10^15 bits | Synonyms: Pb, Pbit |
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| phenobarbital | (noun) a long-acting barbiturate used as a sedative | Synonyms: Luminal, phenobarbitone, purple heart, sodium thiopental |
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| phenobarbitone | (noun) a long-acting barbiturate used as a sedative | Synonyms: Luminal, phenobarbital, purple heart, sodium thiopental |
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| phlebitis | (noun) inflammation of a vein (usually in the legs) | - |
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| phobia | (noun) an anxiety disorder characterized by extreme and irrational fear of simple things or social situations | Synonyms: phobic disorder, phobic neurosis |
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| phobophobia | (noun) a morbid fear of developing a phobia | - |
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| phonophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: acousticophobia |
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| photophobia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photalgia |
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| (noun) a morbid fear of light | - |
| phycobilin | (noun) water-soluble proteinaceous pigments found in red algae and cyanobacteria | - |
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| plausibility | (noun) apparent validity | Synonyms: plausibleness |
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| playbill | (noun) a theatrical program | - |
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| plebiscite | (noun) a vote by the electorate determining public opinion on a question of national importance | - |
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| pliability | (noun) adaptability of mind or character | Synonyms: pliancy, pliantness, suppleness |
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| (noun) the property of being easily bent without breaking | Synonyms: bendability |
| plumbing | (noun) measuring the depths of the oceans | Synonyms: bathymetry |
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| (noun) the occupation of a plumber (installing and repairing pipes and fixtures for water or gas or sewage in a building) | Synonyms: plumbery |
| (noun) utility consisting of the pipes and fixtures for the distribution of water or gas in a building and for the disposal of sewage | Synonyms: plumbing system |
| plumbism | (noun) toxic condition produced by the absorption of excessive lead into the system | Synonyms: lead poisoning, saturnism |
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| portability | (noun) the quality of being light enough to be carried | - |
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| possibility | (noun) a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena | Synonyms: hypothesis, theory |
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| (noun) a possible alternative | Synonyms: opening, possible action |
| (noun) a future prospect or potential | - |
| (noun) capability of existing or happening or being true | Synonyms: possibleness |
| practicability | (noun) the quality of being usable | Synonyms: practicableness |
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| predictability | (noun) the quality of being predictable | - |
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| probabilism | (noun) (philosophy) the doctrine that (since certainty is unattainable) probability is a sufficient basis for belief and action | - |
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| (noun) a Roman Catholic system of casuistry that when expert opinions differ an actor can follow any solidly probable opinion that he wishes even though some different opinion might be more probable | - |
| probability | (noun) the quality of being probable; a probable event or the most probable event | - |
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| (noun) a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible | Synonyms: chance |
| probiotic | (noun) a beneficial bacterium found in the intestinal tract of healthy mammals; often considered to be a plant | Synonyms: probiotic bacterium, probiotic flora, probiotic microflora |
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| (noun) A dietary supplement containing live bacteria, usually taken after a course of antibiotics to replenish the damaged gastrointestinal flora. | - |
| probity | (noun) complete and confirmed integrity; having strong moral principles | - |
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| profitability | (noun) the quality of affording gain or benefit or profit | Synonyms: gainfulness, lucrativeness, profitableness |
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| programmability | (noun) the abstract capability of being programmable. | - |
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| prohibition | (noun) the action of prohibiting or inhibiting or forbidding (or an instance thereof) | Synonyms: forbiddance, inhibition |
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| (noun) a decree that prohibits something | Synonyms: ban, proscription |
| (noun) refusal to approve or assent to | - |
| (noun) a law forbidding the sale of alcoholic beverages | - |
| (noun) the period from 1920 to 1933 when the sale of alcoholic beverages was prohibited in the United States by a constitutional amendment | Synonyms: prohibition era |
| prohibitionist | (noun) a reformer who opposes the use of intoxicating beverages | Synonyms: dry |
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| prothrombin | (noun) a protein in blood plasma that is the inactive precursor of thrombin | Synonyms: factor II |
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| prothrombinase | (noun) coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors | Synonyms: factor X |
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| provability | (noun) capability of being demonstrated or logically proved | Synonyms: demonstrability |
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| psilocybin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocin |
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