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Cro"cus (kr"ks), n.[L., saffron, fr. Gr. kro°kos; cf. Heb. karkm, Ar. kurkum, Skr. kukuma.] 1. (Bot.) A genus of iridaceous plants, with pretty blossoms rising separately from the bulb or corm. C. vernus is one of the earliest of spring-blooming flowers; C. sativus produces the saffron, and blossoms in the autumn. 2. (Chem.) A deep yellow powder; the oxide of some metal calcined to a red or deep yellow color; esp., the oxide of iron (Crocus of Mars or colcothar) thus produced from salts of iron, and used as a polishing powder. Crocus of Venus (Old Chem.), oxide of copper.
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