Meaning of cream of tartar

cream' of tar'tar

Pronunciation: [key]
  1. a white, crystalline, water-soluble powder, CHKO, used chiefly as an ingredient in baking powders and in galvanic tinning of metals. Also calledCf. tartar (def. 3).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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