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Meaning of COLCOTHAR

 
Webster's 1913 Dictionary
 
 Definition: 
\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}.

 

 

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