| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
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| centriole | (noun) one of a pair of small cylindrical cell organelles near the nucleus in animal cells; composed of nine triplet microtubules and form the asters during mitosis | - |
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| compatriot | (noun) a person from your own country | - |
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| endometriosis | (noun) the presence of endometrium elsewhere than in the lining of the uterus; causes premenstrual pain and dysmenorrhea | Synonyms: adenomyosis |
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| estriol | (noun) a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency | Synonyms: oestriol |
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| histrion | (noun) a theatrical performer | Synonyms: actor, player, role player, thespian |
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| histrionics | (noun) a performance of a play | Synonyms: representation, theatrical, theatrical performance |
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| (noun) a deliberate display of emotion for effect | - |
| illustriousness | (noun) the property possessed by something or someone of outstanding importance or eminence | Synonyms: greatness |
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| industriousness | (noun) persevering determination to perform a task | Synonyms: diligence, industry |
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| ketotriose | (noun) Any ketose having three carbon atoms; in reality, only dihydroxyacetone. | - |
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| oestriol | (noun) a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency | Synonyms: estriol |
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| patriot | (noun) one who loves and defends his or her country | Synonyms: nationalist |
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| patrioteer | (noun) an extreme bellicose nationalist | Synonyms: chauvinist, flag-waver, hundred-percenter, jingo, jingoist |
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| patriotism | (noun) love of country and willingness to sacrifice for it | Synonyms: nationalism |
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| superpatriotism | (noun) fanatical patriotism | Synonyms: chauvinism, jingoism, ultranationalism |
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| trio | (noun) a musical composition for three performers | - |
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| (noun) three people considered as a unit | Synonyms: threesome, triad, trinity |
| (noun) a set of three similar things considered as a unit | Synonyms: triad, triple, triplet |
| (noun) three performers or singers who perform together | - |
| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, triplet, troika |
| triode | (noun) a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible | - |
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| triolein | (noun) a naturally occurring glyceride of oleic acid that is found in fats and oils | Synonyms: olein |
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| triose | (noun) any monosaccharide sugar containing three atoms of carbon per molecule | - |
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| trioxide | (noun) an oxide containing three atoms of oxygen in the molecule | - |
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| vitriol | (noun) abusive or venomous language used to express blame or censure or bitter deep-seated ill will | Synonyms: invective, vituperation |
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| (noun) (H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry | Synonyms: oil of vitriol, sulfuric acid, sulphuric acid |