| oligodendria | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendroglia |
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| orphenadrine | (noun) a skeletal muscle relaxant (trade name Norflex) used to treat severe muscle strain and Parkinsonism | Synonyms: Norflex |
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| overdrive | (noun) a high gear used at high speeds to maintain the driving speed with less output power | - |
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| (noun) the state of high or excessive activity or productivity or concentration | - |
| (verb) make use of too often or too extensively | Synonyms: overuse |
| (verb) drive or work too hard | - |
| polyandrist | (noun) a woman with two or more husbands | - |
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| poudrin | (noun) small crystals of ice | Synonyms: diamond dust, frost mist, frost snow, ice crystal, ice needle, snow mist |
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| pseudoephedrine | (noun) poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it | - |
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| quadric | (noun) a curve or surface whose equation (in Cartesian coordinates) is of the second degree | Synonyms: quadric surface |
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| quadriceps | (noun) a muscle of the thigh that extends the leg | Synonyms: musculus quadriceps femoris, quad, quadriceps femoris |
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| quadrilateral | (adjective) having four sides | Synonyms: four-sided |
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| (noun) a four-sided polygon | Synonyms: quadrangle, tetragon |
| quadrille | (noun) a square dance of 5 or more figures for 4 or more couples | - |
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| (noun) music for dancing the quadrille | - |
| quadrillion | (noun) the number that is represented as a one followed by 15 zeros | - |
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| (noun) the number that is represented as a one followed by 24 zeros in the UK | - |
| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
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| (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
| quadripara | (noun) (obstetrics) woman who has given birth to a viable infant in each of four pregnancies | - |
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| quadripartite | (adjective) involving four parties | Synonyms: four-party |
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| quadriphonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadrisonic |
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| quadriplegia | (noun) paralysis of both arms and both legs | - |
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| quadriplegic | (noun) a person who is paralyzed in both arms and both legs | - |
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| quadrisonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadriphonic |
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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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| roughdried | (adjective) (of laundry) dried but not ironed | - |
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| salamandriform | (adjective) shaped like a salamander | - |
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| scolopendrium | (noun) a fern thought to resemble a millipede | - |
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| screwdriver | (noun) a hand tool for driving screws; has a tip that fits into the head of a screw | - |
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| (noun) a cocktail made with vodka and orange juice | - |
| snowdrift | (noun) a mass of snow heaped up by the wind | - |
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| spandril | (noun) an approximately triangular surface area between two adjacent arches and the horizontal plane above them | Synonyms: spandrel |
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| spindrift | (noun) spray blown up from the surface of the sea | Synonyms: spoondrift |
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| spoondrift | (noun) spray blown up from the surface of the sea | Synonyms: spindrift |
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| sundried | (adjective) dried naturally by the sun | Synonyms: sun-dried |
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| sundries | (noun) miscellaneous objects too numerous or too small to be specified | - |
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| tawdrily | (adverb) in a tastelessly garish manner | Synonyms: garishly, gaudily |
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| tawdriness | (noun) tasteless showiness | Synonyms: brashness, flashiness, garishness, gaudiness, glitz, loudness, meretriciousness |
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| taxidriver | (noun) someone who drives a taxi for a living | Synonyms: cabby, cabdriver, cabman, hack-driver, hack driver, livery driver, taximan |
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| tendril | (noun) slender stem-like structure by which some twining plants attach themselves to an object for support | - |
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| undried | (adjective) still wet or moist | - |
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| undrinkable | (adjective) unsuitable for drinking | - |
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