| acacia | (noun) any of various spiny trees or shrubs of the genus Acacia | - |
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| advocacy | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: protagonism |
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| cacao | (noun) tropical American tree producing cacao beans | Synonyms: cacao tree, chocolate tree, Theobroma cacao |
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| cachalot | (noun) large whale with a large cavity in the head containing spermaceti and oil; also a source of ambergris | Synonyms: black whale, Physeter catodon, sperm whale |
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| cache | (noun) a hidden storage space (for money or provisions or weapons) | - |
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| (noun) (computer science) RAM memory that is set aside as a specialized buffer storage that is continually updated; used to optimize data transfers between system elements with different characteristics | Synonyms: memory cache |
| (noun) a secret store of valuables or money | Synonyms: hoard, stash |
| cachet | (noun) a seal on a letter | - |
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| (noun) an indication of approved or superior status | Synonyms: seal, seal of approval |
| (noun) a warrant formerly issued by a French king who could warrant imprisonment or death in a signed letter under his seal | Synonyms: lettre de cachet |
| cachexia | (noun) any general reduction in vitality and strength of body and mind resulting from a debilitating chronic disease | Synonyms: cachexy, wasting |
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| cachexy | (noun) any general reduction in vitality and strength of body and mind resulting from a debilitating chronic disease | Synonyms: cachexia, wasting |
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| cachinnation | (noun) loud convulsive laughter | - |
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| cachou | (noun) a scented lozenge used to sweeten the breath (e.g. to conceal the odor of tobacco) | - |
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| cacique | (noun) black-and-red or black-and-yellow orioles of the American tropics | Synonyms: cazique |
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| cackle | (noun) a loud laugh suggestive of a hen's cackle | - |
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| (noun) noisy talk | Synonyms: chatter, yack, yak, yakety-yak |
| (noun) the sound made by a hen after laying an egg | - |
| cackler | (noun) a hen that has just laid an egg and emits a shrill squawk | - |
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| (noun) any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae | Synonyms: babbler |
| cacodaemon | (noun) an evil spirit | Synonyms: cacodemon |
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| cacodemon | (noun) an evil spirit | Synonyms: cacodaemon |
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| cacodyl | (noun) the univalent group derived from arsine | Synonyms: arsenic group, cacodyl group, cacodyl radical |
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| (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: tetramethyldiarsine |
| cacoethes | (noun) an irrational but irresistible motive for a belief or action | Synonyms: mania, passion |
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| cacogenesis | (noun) inability to produce hybrids that are both viable and fertile | - |
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| cacogenics | (noun) the study of the operation of factors causing degeneration in the type of offspring produced | Synonyms: dysgenics |
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| cacography | (noun) poor handwriting | Synonyms: scratch, scrawl, scribble |
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| cacomistle | (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomixle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat, ringtail |
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| cacomixle | (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomistle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat, ringtail |
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| cacophony | (noun) loud confusing disagreeable sounds | - |
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| (noun) a loud harsh or strident noise | Synonyms: blare, blaring, clamor, din |
| cactus | (noun) any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines | - |
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| delicacy | (noun) the quality of being beautiful and delicate in appearance | Synonyms: daintiness, fineness |
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| (noun) subtly skillful handling of a situation | Synonyms: diplomacy, discreetness, finesse |
| (noun) lack of physical strength | Synonyms: fragility |
| (noun) slenderness | Synonyms: slightness |
| (noun) lightness in movement or manner | Synonyms: airiness |
| (noun) refined taste; tact | Synonyms: discretion |
| (noun) something considered choice to eat | Synonyms: dainty, goody, kickshaw, treat |
| echinocactus | (noun) any cactus of the genus Echinocactus; strongly ribbed and very spiny; southwestern United States to Brazil | Synonyms: barrel cactus |
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| efficaciousness | (noun) capacity or power to produce a desired effect | Synonyms: efficacy |
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| efficacy | (noun) capacity or power to produce a desired effect | Synonyms: efficaciousness |
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| icaco | (noun) plum-shaped whitish to almost black fruit used for preserves; tropical American | Synonyms: coco plum, cocoa plum |
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| (noun) small tropical American tree bearing edible plumlike fruit | Synonyms: Chrysobalanus icaco, coco plum, coco plum tree, cocoa plum |
| indelicacy | (noun) an impolite act or expression | - |
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| (noun) the trait of being indelicate and offensive | - |
| inefficaciousness | (noun) a lack of efficacy | Synonyms: inefficacy |
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| inefficacy | (noun) a lack of efficacy | Synonyms: inefficaciousness |
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| intricacy | (noun) marked by elaborately complex detail | Synonyms: elaborateness, elaboration, involution |
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| ipecac | (noun) a medicinal drug used to evoke vomiting (especially in cases of drug overdose or poisoning) | - |
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| perspicaciousness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: astuteness, perspicacity, shrewdness |
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| perspicacity | (noun) the capacity to assess situations or circumstances shrewdly and to draw sound conclusions | Synonyms: judgement, judgment, sound judgement, sound judgment |
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| (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: astuteness, perspicaciousness, shrewdness |
| prolificacy | (noun) the property of producing abundantly and sustaining vigorous and luxuriant growth | Synonyms: fertility, rankness, richness |
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| uricaciduria | (noun) presence of abnormal amounts of uric acid in the urine; symptom of gout | - |
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| viscacha | (noun) gregarious burrowing rodent larger than the chinchillas | Synonyms: chinchillon, Lagostomus maximus |
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