Col″co‐thar (kŏl″kō̍‐thẽr), n. [NL. colcothar vitrioli, fr. Ar. qolqoṭar.] (Chem.) Polishing rouge; a reddish brown oxide of iron, used in polishing glass, and also as a pigment; — called also crocus Martis.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.