A brownish-red ferric oxide obtained as a residue after heating ferrous sulfate, used in glass polishing and as a pigment.
A brownish-red oxide of iron, obtained by heating ferrous sulfate: it is used as a pigment, polishing agent, etc.
Origin of colcothar
- Medieval Latin from Spanish colcótar from Arabic qulquṭār possibly from Greek khalkanthos copper sulfate khalkos copper anthos flower
From American Heritage Dictionary of the English Language, 5th Edition
- From Arabic qolqotar.