| 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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| orthotropous | (adjective) (of a plant ovule) completely straight with the micropyle at the apex | - |
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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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| outroar | (verb) roar louder than | - |
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| outstroke | (noun) the stroke of an engine piston moving toward the crankshaft | - |
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| pantropic | (adjective) distributed throughout the tropics | Synonyms: pantropical |
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| pantropical | (adjective) distributed throughout the tropics | Synonyms: pantropic |
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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 | - |
| (verb) maintain the security of by carrying out a patrol | Synonyms: police |
| 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 |
| (verb) be a regular customer or client of | Synonyms: keep going, patronise, patronize, support |
| (verb) support by being a patron of | - |
| patroness | (noun) a woman who is a patron or the wife of a patron | Synonyms: patronne |
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| patronise | (verb) be a regular customer or client of | Synonyms: keep going, patronage, patronize, support |
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| (verb) treat condescendingly | Synonyms: condescend, patronize |
| (verb) assume sponsorship of | Synonyms: patronize, sponsor |
| (verb) do one's shopping at; do business with; be a customer or client of | Synonyms: buy at, frequent, patronize, shop, shop at, sponsor |
| patronised | (adjective) having patronage or clients | Synonyms: patronized |
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| patronising | (adjective) (used of behavior or attitude) characteristic of those who treat others with condescension | Synonyms: arch, condescending, patronizing |
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| patronisingly | (adverb) with condescension; in a patronizing manner | Synonyms: condescendingly, patronizingly |
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| patronize | (verb) be a regular customer or client of | Synonyms: keep going, patronage, patronise, support |
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| (verb) treat condescendingly | Synonyms: condescend, patronise |
| (verb) assume sponsorship of | Synonyms: patronise, sponsor |
| (verb) do one's shopping at; do business with; be a customer or client of | Synonyms: buy at, frequent, patronise, shop, shop at, sponsor |
| patronized | (adjective) having patronage or clients | Synonyms: patronised |
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| patronizing | (adjective) (used of behavior or attitude) characteristic of those who treat others with condescension | Synonyms: arch, condescending, patronising |
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| patronizingly | (adverb) with condescension; in a patronizing manner | Synonyms: condescendingly, patronisingly |
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| patronless | (adjective) having little patronage or few clients | Synonyms: unpatronised, unpatronized |
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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 | (adjective) of or derived from a personal or family name | - |
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| (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 |
| 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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| petrous | (adjective) (of bone especially the temporal bone) resembling stone in hardness | Synonyms: stonelike |
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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 | (adjective) characterized by complete cowardliness | - |
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| (noun) an abject coward | Synonyms: craven, recreant |
| poltroonery | (noun) abject pusillanimity | - |
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| polyelectrolyte | (noun) an electrolyte of high molecular weight | - |
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| polyestrous | (adjective) having more than one period of estrus per year | Synonyms: polyoestrous |
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| polyoestrous | (adjective) having more than one period of estrus per year | Synonyms: polyestrous |
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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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| psychotropic | (adjective) affecting the mind or mood or other mental processes | Synonyms: psychoactive |
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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 | - |
| reintroduce | (verb) introduce anew | Synonyms: re-introduce |
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| 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 | (adjective) affecting things past | Synonyms: ex post facto, retroactive |
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| (noun) a fashion reminiscent of the past | - |
| retroactive | (adjective) descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously | - |
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| (adjective) affecting things past | Synonyms: ex post facto, retro |
| retroactively | (adverb) after the fact | - |
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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 | - |
| (verb) substitute new or modernized parts or equipment for older ones | - |
| (verb) fit in or on an existing structure, such as an older house | - |
| (verb) provide with parts, devices, or equipment not available or in use at the time of the original manufacture | - |
| 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 |
| retroflex | (adjective) bent or curved backward | Synonyms: retroflexed |
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| (adjective) pronounced with the tip of the tongue turned back toward the hard palate | Synonyms: cacuminal |
| (verb) articulate (a consonant) with the tongue curled back against the palate | - |
| (verb) bend or turn backward | Synonyms: replicate |
| retroflexed | (adjective) bent or curved backward | Synonyms: retroflex |
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| 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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| retrograde | (adjective) of amnesia; affecting time immediately preceding trauma | - |
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| (adjective) moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth | - |
| (adjective) going from better to worse | Synonyms: retrogressive |
| (adjective) moving or directed or tending in a backward direction or contrary to a previous direction | Synonyms: retral |
| (verb) get worse or fall back to a previous condition | Synonyms: regress, retrogress |
| (verb) go back over | Synonyms: hash over, rehash |
| (verb) move back | Synonyms: retreat |
| (verb) move in a direction contrary to the usual one | - |
| (verb) move backward in an orbit, of celestial bodies | - |
| retrogress | (verb) go back to bad behavior | Synonyms: fall back, lapse, recidivate, regress, relapse |
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| (verb) get worse or fall back to a previous condition | Synonyms: regress, retrograde |
| 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 |
| retrogressive | (adjective) going from better to worse | Synonyms: retrograde |
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| 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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| retrorse | (adjective) bent or curved backward or downward | - |
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| retrospect | (noun) contemplation of things past | - |
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| (verb) look back upon (a period of time, sequence of events); remember | Synonyms: look back, review |
| retrospection | (noun) memory for experiences that are past | - |
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| (noun) reference to things past | - |
| retrospective | (adjective) concerned with or related to the past | - |
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| (noun) an exhibition of a representative selection of an artist's life work | - |
| retrospectively | (adverb) in a manner contemplative of past events | - |
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| retrousse | (adjective) (used of noses) turned up at the end | Synonyms: tip-tilted, upturned |
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| retroversion | (noun) returning to a former state | Synonyms: regress, regression, retrogression, reversion |
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| (noun) translation back into the original language | - |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflection, retroflexion |
| retrovert | (verb) go back to a previous state | Synonyms: regress, return, revert, turn back |
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| retrovirus | (noun) any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | - |
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| retrovision | (noun) a vision of events in the distant past | - |
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| semitropic | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropical, subtropic, subtropical |
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| semitropical | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropic, subtropic, subtropical |
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| semitropics | (noun) regions adjacent to the tropics | Synonyms: subtropics |
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| sidestroke | (noun) a swimming stroke in which the arms move forward and backward while the legs do a scissors kick | - |
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| sinistrorsal | (adjective) spiraling upward from right to left | Synonyms: sinistrorse |
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| sinistrorse | (adjective) spiraling upward from right to left | Synonyms: sinistrorsal |
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| somatotrophin | (noun) a hormone produced by the anterior pituitary gland; promotes growth in humans | Synonyms: growth hormone, human growth hormone, somatotrophic hormone, somatotropic hormone, somatotropin, STH |
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| somatotropin | (noun) a hormone produced by the anterior pituitary gland; promotes growth in humans | Synonyms: growth hormone, human growth hormone, somatotrophic hormone, somatotrophin, somatotropic hormone, STH |
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| spectrogram | (noun) a photographic record of a spectrum | Synonyms: spectrograph |
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| spectrograph | (noun) a spectroscope by which spectra can be photographed | - |
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| (noun) a photographic record of a spectrum | Synonyms: spectrogram |
| spectrographic | (adjective) relating to or employing a spectrograph | - |
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| spectrographically | (adverb) by spectrographic means | - |
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| spectrometer | (noun) spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | Synonyms: mass spectrometer |
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| spectrometric | (adjective) of or relating to or involving spectrometry | - |
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| spectrometry | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectroscopic analysis, spectroscopy, spectrum analysis |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| spectroscope | (noun) an optical instrument for spectrographic analysis | Synonyms: prism spectroscope |
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| spectroscopic | (adjective) of or relating to or involving spectroscopy | Synonyms: spectroscopical |
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| spectroscopical | (adjective) of or relating to or involving spectroscopy | Synonyms: spectroscopic |
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| spectroscopy | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectrometry, spectroscopic analysis, spectrum analysis |
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| stabilitron | (noun) a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator | Synonyms: zenerdiode |
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| stilbestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilbestrol, diethylstilboestrol, stilboestrol |
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