colcothar

(käl′kō t̸hər, -kə-)

noun

a brownish-red oxide of iron, obtained by heating ferrous sulfate: it is used as a pigment, polishing agent, etc.

Origin: Sp colcotar < Ar qulqutār < Gr chalkanthos, solution of blue vitriol (copper sulfate) < chalkos, copper + anthos, flower

See colcothar in American Heritage Dictionary 4

noun

A brownish-red ferric oxide obtained as a residue after heating ferrous sulfate, used in glass polishing and as a pigment.

Origin:

Origin: Medieval Latin

Origin: , from Spanish colcótar

Origin: , from Arabic qulquṭār

Origin: , possibly from Greek khalkanthos, copper sulfate

Origin: : khalkos, copper

Origin: + anthos, flower

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