'Colcothar' definitions:
Definition of 'Colcothar'
From: GCIDE
- Colcothar \Col"co*thar\ (k[o^]l"k[-o]*th[~e]r), n. [NL. colcothar vitrioli, fr. Ar. qolqo[.t]ar.] (Chem.) Polishing rouge; a reddish brown oxide of iron, used in polishing glass, and also as a pigment; -- called also crocus Martis. [1913 Webster]
Definition of 'colcothar'
From: GCIDE
- Crocus \Cro"cus\ (kr[=o]"k[u^]s), n. [L., saffron, fr. Gr. kro`kos; cf. Heb. kark[=o]m, Ar. kurkum, Skr. ku[.n]kuma.]
- 1. (Bot.) A genus of iridaceous plants, with pretty blossoms rising separately from the bulb or corm. Crocus vernus is one of the earliest of spring-blooming flowers; {Crocus sativus} produces the saffron, and blossoms in the autumn. [1913 Webster]
- 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. [1913 Webster]
- Crocus of Venus (Old Chem.), oxide of copper. [1913 Webster]