col|co|thar

col|co|thar
col|co|thar «KOL kuh thuhr», noun.
a brownish-red oxide of iron which remains after heating ferrous sulfate, used as a polishing agent and as coloring matter; jewelers' rouge.
[< Medieval Latin colcotar < Arabic qolqotār copperas, perhaps < Greek chálkanthos chalcanth]

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