| calcimine | (noun) a water-base paint containing zinc oxide and glue and coloring; used as a wash for walls and ceilings | - |
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| cimarron | (noun) wild sheep of mountainous regions of western North America having massive curled horns | Synonyms: bighorn, bighorn sheep, Ovis canadensis, Rocky Mountain bighorn, Rocky Mountain sheep |
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| cimetidine | (noun) a drug (trade name Tagamet) used to treat peptic ulcers by decreasing the secretion of stomach acid | Synonyms: Tagamet |
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| decimal | (noun) a proper fraction whose denominator is a power of 10 | Synonyms: decimal fraction |
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| (noun) a number in the decimal system | - |
| decimalisation | (noun) the act of changing to a decimal system | Synonyms: decimalization |
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| decimalization | (noun) the act of changing to a decimal system | Synonyms: decimalisation |
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| decimation | (noun) destroying or killing a large part of the population | - |
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| decimeter | (noun) a metric unit of length equal to one tenth of a meter | Synonyms: decimetre, dm |
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| decimetre | (noun) a metric unit of length equal to one tenth of a meter | Synonyms: decimeter, dm |
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| dulcimer | (noun) a trapezoidal zither whose metal strings are struck with light hammers | - |
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| (noun) a stringed instrument used in American folk music; an elliptical body and a fretted fingerboard and three strings | - |
| duodecimal | (noun) one part in twelve equal parts | Synonyms: one-twelfth, twelfth, twelfth part |
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| scimitar | (noun) a curved oriental saber; the edge is on the convex side of the blade | - |
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| specimen | (noun) a bit of tissue or blood or urine that is taken for diagnostic purposes | - |
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| (noun) an example regarded as typical of its class | - |