a. Chem. [f. CHROME + -OUS.] Of or pertaining to chromium: applied to compounds in which it combines as a dyad.
1840. Henry, Elem. Chem., II. 63. Deutoxide (Chromous acid).
1873. Williamson, Chem., § 187. Chromous oxide is analogous in its salts to ferrous oxide. Ibid., § 189. Chromous chloride Cr Cl2.
