| pacing | (noun) walking with slow regular strides | - |
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| (noun) (music) the speed at which a composition is to be played | Synonyms: tempo |
| pentazocine | (noun) analgesic drug (trade name Talwin) that is less addictive than morphine | Synonyms: Talwin |
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| precinct | (noun) a district of a city or town marked out for administrative purposes | - |
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| pricing | (noun) the evaluation of something in terms of its price | - |
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| pseudohallucination | (noun) an image vivid enough to be a hallucination but recognized as unreal | - |
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| psilocin | (noun) a hallucinogenic compound obtained from a mushroom | Synonyms: psilocybin |
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| (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocine, psilocyn, psilotsin |
| psilocine | (noun) a substituted tryptamine alkaloid and a serotonergic psychedelic substance, present in most psychedelic mushrooms together with its phosphorylated counterpart psilocybin. | Synonyms: psilocin, psilocyn, psilotsin |
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| putrescine | (noun) a colorless crystalline ptomaine with a foul odor that is produced in decaying animal matter | - |
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| raciness | (noun) behavior or language bordering on indelicacy | Synonyms: gaminess, ribaldry, spiciness |
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| (noun) a strong odor or taste property | Synonyms: bite, pungency, sharpness |
| racing | (noun) the sport of engaging in contests of speed | - |
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| ratiocination | (noun) logical and methodical reasoning | - |
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| (noun) the proposition arrived at by logical reasoning (such as the proposition that must follow from the major and minor premises of a syllogism) | Synonyms: conclusion |
| ratiocinator | (noun) someone who reasons logically | Synonyms: reasoner |
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| reducing | (noun) any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent | Synonyms: reduction |
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| (noun) loss of excess weight (as by dieting); becoming slimmer | - |
| rejoicing | (noun) the utterance of sounds expressing great joy | Synonyms: exultation, jubilation |
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| (noun) a feeling of great happiness | - |
| replacing | (noun) the act of furnishing an equivalent person or thing in the place of another | Synonyms: replacement |
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| resorcinol | (noun) a crystalline phenol obtained from various resins; used in ointments for acne and in dandruff shampoos | - |
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| resorcinolphthalein | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluoresceine, fluorescent dye |
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| ricin | (noun) a toxic protein extracted from castor beans; used as a chemical reagent; can be used as a bioweapon | Synonyms: ricin toxin |
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| salicin | (noun) an anti-inflammatory agent that is produced from willow bark. | - |
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| sauciness | (noun) inappropriate playfulness | Synonyms: archness, impertinence, perkiness, pertness |
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| scincid | (noun) alert agile lizard with reduced limbs and an elongated body covered with shiny scales; more dependent on moisture than most lizards; found in tropical regions worldwide | Synonyms: scincid lizard, skink |
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| scintigram | (noun) a recording of the radioactivity emitted by a tracer in an organism or organ system. | - |
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| scintigraph | (noun) The apparatus used to make a scintigram. | Synonyms: scintiscanner |
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| scintilla | (noun) a sparkling glittering particle | - |
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| (noun) a tiny or scarcely detectable amount | Synonyms: iota, shred, smidge, smidgen, smidgeon, smidgin, tittle, whit |
| scintillation | (noun) the quality of shining with a bright reflected light | Synonyms: glisten, glister, glitter, sparkle |
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| (noun) the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight | - |
| (noun) a brilliant display of wit | - |
| (noun) a rapid change in brightness; a brief spark or flash | Synonyms: sparkling, twinkle |
| (noun) (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle | - |
| scintiscanner | (noun) The apparatus used to make a scintigram. | Synonyms: scintigraph |
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| servicing | (noun) the act of mating by male animals | Synonyms: service |
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| slicing | (noun) the act of cutting into slices | - |
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| (noun) a golf shot that curves to the right for a right-handed golfer | Synonyms: fade, slice |
| spacing | (noun) the property possessed by an array of things that have space between them | Synonyms: spatial arrangement |
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| (noun) the time between occurrences of a repeating event | - |
| spectinomycin | (noun) an antibiotic used to treat gonorrhea | - |
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| spiciness | (noun) the property of being seasoned with spice and so highly flavored | Synonyms: spice, spicery |
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| (noun) behavior or language bordering on indelicacy | Synonyms: gaminess, raciness, ribaldry |
| splicing | (noun) a junction where two things (as paper or film or magnetic tape) have been joined together | Synonyms: splice |
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| streptomycin | (noun) an antibiotic produced by the actinomycete Streptomyces griseus and used to treat tuberculosis | - |
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| streptothricin | (noun) a basic antibiotic derived from a soil actinomycete | - |
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| succinctness | (noun) terseness and economy in writing and speaking achieved by expressing a great deal in just a few words | Synonyms: conciseness, concision, pithiness |
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| succinylcholine | (noun) a muscle relaxant for striated muscle that is used as an adjunct to anesthesia during certain surgical procedures | - |
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| surfacing | (noun) emerging to the surface and becoming apparent | - |
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| teleconferencing | (noun) a conference of people who are in different locations that is made possible by the use of such telecommunications equipment as closed-circuit television | Synonyms: teleconference |
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| thylacine | (noun) rare doglike carnivorous marsupial of Tasmania having stripes on its back; probably extinct | Synonyms: Tasmanian tiger, Tasmanian wolf, Thylacinus cynocephalus |
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| tobramycin | (noun) an antibiotic (trade name Nebcin) that is especially effective against Gram-negative bacteria | Synonyms: Nebcin |
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| tracing | (noun) the act of drawing a plan or diagram or outline | - |
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| (noun) the discovery and description of the course of development of something | - |
| (noun) a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image | Synonyms: trace |
| triamcinolone | (noun) a synthetic corticosteroid (trade names Aristocort or Aristopak or Kenalog) used as an anti-inflammatory agent | Synonyms: Aristocort, Aristopak, Kenalog |
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| trouncing | (noun) the act of inflicting corporal punishment with repeated blows | Synonyms: beating, drubbing, lacing, licking, thrashing, whacking |
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| (noun) a sound defeat | Synonyms: debacle, drubbing, slaughter, thrashing, walloping, whipping |
| tyrothricin | (noun) a mixture of antibiotics applied locally to infections caused by Gram-positive bacteria | - |
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| vaccina | (noun) a local infection induced in humans by inoculation with the virus causing cowpox in order to confer resistance to smallpox; normally lasts three weeks and leaves a pitted scar | Synonyms: vaccinia, variola vaccina, variola vaccine, variola vaccinia |
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| vaccinating | (noun) the act of protecting against disease by introducing a vaccine into the body to induce immunity | Synonyms: inoculating |
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| vaccination | (noun) taking a vaccine as a precaution against contracting a disease | Synonyms: inoculation |
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| (noun) the scar left following inoculation with a vaccine | - |
| vaccinator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: inoculator |
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| vaccine | (noun) immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies | Synonyms: vaccinum |
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| vaccinee | (noun) a patient who has been vaccinated | - |
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| vaccinia | (noun) a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox | Synonyms: cowpox |
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| (noun) a local infection induced in humans by inoculation with the virus causing cowpox in order to confer resistance to smallpox; normally lasts three weeks and leaves a pitted scar | Synonyms: vaccina, variola vaccina, variola vaccine, variola vaccinia |
| vaccinum | (noun) immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies | Synonyms: vaccine |
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| vancomycin | (noun) an antibiotic (trade name Vancocin) effective against some bacterial infections | Synonyms: Vancocin |
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| vaticination | (noun) knowledge of the future (usually said to be obtained from a divine source) | Synonyms: prognostication, prophecy |
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| vaticinator | (noun) an authoritative person who divines the future | Synonyms: oracle, prophesier, prophet, seer |
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| vicinity | (noun) a surrounding or nearby region | Synonyms: locality, neck of the woods, neighborhood, neighbourhood |
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| viomycin | (noun) a basic polypeptide antibiotic (trade name Viocin) administered intramuscularly (along with other drugs) in the treatment of tuberculosis | Synonyms: Viocin |
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| voicing | (noun) the act of adjusting an organ pipe (or wind instrument) so that it conforms to the standards of tone and pitch and color | - |
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