chromium: Meaning and Definition of

chro•mi•um

1. a lustrous, hard, brittle, metallic element used in alloy steels for hardness and corrosion resistance, as in stainless steel, and for plating other metals: chromium salts are used as pigments and mordants. Symbol: Cr; at. wt.: 51.996; at. no.: 24; sp. gr.: 7.1.
2. chrome (def. 2).