| introspectionism | (noun) a doctrine that psychology must be based essentially on data derived from introspection. | - |
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| introspectiveness | (noun) thoughtfulness about your own situation and feelings | - |
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| introversion | (noun) (psychology) an introverted disposition; concern with one's own thoughts and feelings | - |
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| (noun) the folding in of an outer layer so as to form a pocket in the surface | Synonyms: infolding, intussusception, invagination |
| (noun) the condition of being folded inward or sheathed | Synonyms: invagination |
| introvert | (noun) (psychology) a person who tends to shrink from social contacts and to become preoccupied with their own thoughts | - |
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| isometropia | (noun) equality of refractive power in the two eyes | - |
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| isotropy | (noun) (physics) the property of being isotropic; having the same value when measured in different directions | Synonyms: symmetry |
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| kenotron | (noun) a type of vacuum tube formerly used as a high-voltage rectifier. | - |
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| ketotetrose | (noun) A monosaccharide that has both a ketone and four carbons. | - |
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| keystroke | (noun) the stroke of a key; one depression of a key on a keyboard | Synonyms: key stroke |
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| klystron | (noun) an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation | - |
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| lipochondrodystrophy | (noun) hereditary disease (autosomal recessive) consisting of an error is mucopolysaccharide metabolism; characterized by severe abnormalities in development of skeletal cartilage and bone and mental retardation | Synonyms: dysostosis multiplex, gargoylism, Hurler's disease, Hurler's syndrome |
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| luteotropin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, prolactin |
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| maelstrom | (noun) a powerful circular current of water (usually the result of conflicting tides) | Synonyms: vortex, whirlpool |
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| maestro | (noun) an artist of consummate skill | Synonyms: master |
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| magnetron | (noun) a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators | - |
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| masterstroke | (noun) an achievement demonstrating great skill or mastery | - |
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| matron | (noun) a married woman (usually middle-aged with children) who is staid and dignified | - |
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| (noun) a woman in charge of nursing in a medical institution | - |
| (noun) a wardress in a prison | - |
| matronymic | (noun) a name derived from the name of your mother or a maternal ancestor | Synonyms: metronymic |
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| megestrol | (noun) a synthetic progestational compound used to treat endometrial carcinoma | Synonyms: megestrol acetate |
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| mesotron | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: meson |
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| meteortropism | (noun) an effect of climate on biological processes (as the effect on joint pains etc.) | - |
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| metro | (noun) an electric railway operating below the surface of the ground (usually in a city) | Synonyms: subway, subway system, tube, underground |
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| metrology | (noun) the scientific study of measurement | - |
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| metronidazole | (noun) antiprotozoal medication (trade name Flagyl) used to treat trichomoniasis and giardiasis | Synonyms: Flagyl |
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| metronome | (noun) clicking pendulum indicates the exact tempo of a piece of music | - |
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| metronymic | (noun) a name derived from the name of your mother or a maternal ancestor | Synonyms: matronymic |
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| metropolis | (noun) people living in a large densely populated municipality | Synonyms: city |
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| (noun) a large and densely populated urban area; may include several independent administrative districts | Synonyms: city, urban center |
| metropolitan | (noun) a person who lives in a metropolis | - |
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| (noun) in the Eastern Orthodox Church this title is given to a position between bishop and patriarch; equivalent to archbishop in western Christianity | - |
| metroptosis | (noun) prolapse of the uterus | Synonyms: descensus uteri |
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| metrorrhagia | (noun) bleeding from the uterus that is not due to menstruation; usually indicative of disease (as cervical cancer) | - |
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| microelectronics | (noun) the branch of electronics that deals with miniature components | - |
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| minestrone | (noun) soup made with a variety of vegetables | Synonyms: petite marmite, vegetable soup |
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| monstrosity | (noun) something hideous or frightful | - |
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| (noun) a person or animal that is markedly unusual or deformed | Synonyms: freak, lusus naturae, monster |
| natrolite | (noun) a group of minerals of the zeolite family consisting of a hydrous silicate of sodium and aluminum | - |
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| negatron | (noun) an elementary particle with negative charge | Synonyms: electron |
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| neurotropism | (noun) an affinity for neural tissues | - |
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| neutron | (noun) an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus | - |
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| neutropenia | (noun) leukopenia in which the decrease is primarily in number of neutrophils (the chief phagocytic leukocyte) | - |
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| neutrophil | (noun) the chief phagocytic leukocyte; stains with either basic or acid dyes | Synonyms: neutrophile |
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| neutrophile | (noun) the chief phagocytic leukocyte; stains with either basic or acid dyes | Synonyms: neutrophil |
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| nitrobacteria | (noun) soil bacteria that convert nitrites to nitrates | Synonyms: nitric bacteria |
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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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| nitrobenzene | (noun) a poisonous oily water-soluble liquid used as a solvent and in the manufacture of aniline | - |
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| nitrocalcite | (noun) the mineral form of calcium nitrate | - |
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| nitrocellulose | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocotton |
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| nitrochloroform | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: chloropicrin |
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| nitrochloromethane | (noun) gaseous form of chloropicrin used as tear gas | - |
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| nitrocotton | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocellulose |
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| nitrofuran | (noun) derivative of furan used to inhibit bacterial growth | - |
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| nitrofurantoin | (noun) derivative of nitrofuran used as an antibacterial medicine (trade name Macrodantin) effective against a broad range of Gram-positive and Gram-negative bacteria; used to treat infections of the urinary tract | Synonyms: Macrodantin |
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| nitrogen | (noun) a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues | Synonyms: atomic number 7, N |
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| nitrogenase | (noun) an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia | - |
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| nitroglycerin | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerine, Nitrospan, Nitrostat, trinitroglycerin |
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| nitroglycerine | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerin, Nitrospan, Nitrostat, trinitroglycerin |
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| nitrosobacteria | (noun) soil bacteria that oxidize ammonia to nitrites | Synonyms: nitrous bacteria |
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| octroi | (noun) a tax on various goods brought into a town | - |
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| oestrogen | (noun) a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics | Synonyms: estrogen |
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| oestrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: estrone, Estronol, theelin |
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| osteodystrophy | (noun) defective bone development; usually attributable to renal disease or to disturbances in calcium and phosphorus metabolism | - |
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| osteopetrosis | (noun) an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated | Synonyms: Albers-Schonberg disease, marble bones disease |
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| outstroke | (noun) the stroke of an engine piston moving toward the crankshaft | - |
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| paratrooper | (noun) a soldier in the paratroops | Synonyms: para |
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| paratroops | (noun) infantry trained and equipped to parachute | - |
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| patrol | (noun) the activity of going around or through an area at regular intervals for security purposes | - |
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| (noun) a detachment used for security or reconnaissance | - |
| (noun) a group that goes through a region at regular intervals for the purpose of security | - |
| patroller | (noun) someone on patrol duty; an individual or a member of a group that patrols an area | - |
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| patrolman | (noun) a policeman who patrols a given region | Synonyms: flatfoot |
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| patrology | (noun) the study of the lives, writings, and doctrines of the Church Fathers | Synonyms: patristics |
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| (noun) the writings of the early Church Fathers | Synonyms: patristics |
| patron | (noun) a regular customer | Synonyms: frequenter |
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| (noun) someone who supports or champions something | Synonyms: sponsor, supporter |
| (noun) the proprietor of an inn | - |
| patronage | (noun) the act of providing approval and support | Synonyms: backing, backup, championship |
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| (noun) (politics) granting favors or giving contracts or making appointments to office in return for political support | - |
| (noun) the business given to a commercial establishment by its customers | Synonyms: trade |
| (noun) a communication that indicates lack of respect by patronizing the recipient | Synonyms: condescension, disdain |
| (noun) customers collectively | Synonyms: business, clientele |
| patroness | (noun) a woman who is a patron or the wife of a patron | Synonyms: patronne |
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| patronne | (noun) a woman who is a patron or the wife of a patron | Synonyms: patroness |
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| patronym | (noun) a family name derived from name of your father or a paternal ancestor (especially with an affix (such as -son in English or O'- in Irish) added to the name of your father or a paternal ancestor) | Synonyms: patronymic |
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| patronymic | (noun) a family name derived from name of your father or a paternal ancestor (especially with an affix (such as -son in English or O'- in Irish) added to the name of your father or a paternal ancestor) | Synonyms: patronym |
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| perestroika | (noun) an economic policy adopted in the former Soviet Union; intended to increase automation and labor efficiency but it led eventually to the end of central planning in the Russian economy | - |
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| petrochemical | (noun) any compound obtained from petroleum or natural gas | - |
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| petroglyph | (noun) a carving or line drawing on rock (especially one made by prehistoric people) | - |
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| petrol | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasolene, gasoline |
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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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| petrology | (noun) the branch of geology that studies rocks: their origin and formation and mineral composition and classification | Synonyms: lithology |
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| photoelectron | (noun) an electron that is emitted from an atom or molecule by an incident photon | - |
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| phototropism | (noun) an orienting response to light | - |
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| plastron | (noun) (zoology) the part of a turtle's shell forming its underside | - |
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| (noun) a large pad worn by a fencer to protect the chest | - |
| (noun) a metal breastplate that was worn under a coat of mail | - |
| (noun) the front of man's dress shirt | - |
| (noun) the ornamental front of a woman's bodice or shirt | - |
| plectron | (noun) a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument | Synonyms: pick, plectrum |
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| poltroon | (noun) an abject coward | Synonyms: craven, recreant |
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| poltroonery | (noun) abject pusillanimity | - |
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| polyelectrolyte | (noun) an electrolyte of high molecular weight | - |
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| positron | (noun) an elementary particle with positive charge; interaction of a positron and an electron results in annihilation | Synonyms: antielectron |
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| quattrocento | (noun) the 15th century in Italian art and literature | - |
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| quercitron | (noun) medium to large deciduous timber tree of the eastern United States and southeastern Canada having dark outer bark and yellow inner bark used for tanning; broad five-lobed leaves are bristle-tipped | Synonyms: black oak, quercitron oak, Quercus velutina, yellow oak |
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| (noun) a yellow dye made from the bark of the quercitron oak tree | - |
| reintroduction | (noun) an act of renewed introduction | - |
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| restroom | (noun) a toilet that is available to the public | Synonyms: comfort station, convenience, public convenience, public lavatory, public toilet, toilet facility, wash room |
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| retro | (noun) a fashion reminiscent of the past | - |
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| retrofit | (noun) the act of adding a component or accessory to something that did not have it when it was manufactured | - |
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| (noun) a component or accessory added to something after it has been manufactured | - |
| retroflection | (noun) the act of bending backward | Synonyms: retroflexion |
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| (noun) an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth | Synonyms: retroflexion |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflexion, retroversion |
| retroflexion | (noun) the act of bending backward | Synonyms: retroflection |
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| (noun) an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth | Synonyms: retroflection |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflection, retroversion |
| retrogaming | (noun) The hobby of playing or collecting older video games and computer games. | - |
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| retrogression | (noun) returning to a former state | Synonyms: regress, regression, retroversion, reversion |
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| (noun) passing from a more complex to a simpler biological form | Synonyms: degeneration |
| retronym | (noun) a word introduced because an existing term has become inadequate | - |
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| retrorocket | (noun) a small rocket engine on a larger rocket or spacecraft that is fired to slow or alter its course | - |
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