(definition) by Webster 1913 Tue Dec 21 1999 at 22:35:16

Col"co*thar (?), n. [NL. colcothar vitrioli, fr. Ar. qolqotar.] Chem.

Polishing rouge; a reddish brown oxide of iron, used in polishing glass, and also as a pigment; -- called also crocus Martis.

 

© Webster 1913.

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