Colcothar meaning

kŏlkə-thər, -thär
A brownish-red ferric oxide obtained as a residue after heating ferrous sulfate, used in glass polishing and as a pigment.
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A brownish-red oxide of iron, obtained by heating ferrous sulfate: it is used as a pigment, polishing agent, etc.
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(organic chemistry, obsolete) Polishing rouge; a reddish-brown oxide of iron, used in polishing glass, and also as a pigment; crocus Martis.
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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.

    From Wiktionary