colcothar

[ kol-kuh-ther ]
/ ˈkɒl kə θər /
|

noun Chemistry.

the brownish-red oxide of iron produced by heating ferrous sulfate: used chiefly as a pigment in paints and theatrical rouge, and as a polishing agent.

Nearby words

  1. colcannon,
  2. colchester,
  3. colchicine,
  4. colchicum,
  5. colchis,
  6. cold,
  7. cold abscess,
  8. cold agglutination,
  9. cold agglutinin,
  10. cold brew

Origin of colcothar

1595–1605; < Medieval Latin < Old Spanish colcotar, Spanish Arabic qulquṭār, perhaps < Greek chálkanthos copper sulfate solution

Also called jewelers' rouge.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for colcothar

colcothar

/ (ˈkɒlkəˌθɑː) /

noun

a finely powdered form of ferric oxide produced by heating ferric sulphate and used as a pigment and as jewellers' rougeAlso called: crocus

Word Origin for colcothar

C17: from French colcotar, from Spanish colcótar, from Arabic dialect qulqutār

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012