Rouge \Rouge\, n. [F.] 1. (Chem.) A red amorphous powder consisting of ferric oxide. It is used in polishing glass, metal, or gems, and as a cosmetic, etc. Called also {crocus}, {jeweler's rouge}, etc. 2. A cosmetic used for giving a red color to the cheeks or lips. The best is prepared from the dried flowers of the safflower, but it is often made from carmine. --Ure.