Hypertext Webster Gateway: "colcothar"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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. {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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