Chlo″rous (?), a. [See Chlorine.] 1. Of, pertaining to, or derived from, chlorine; — said of those compounds of chlorine in which this element has a valence of three, the next lower than in chloric compounds; as, chlorous acid, HClO2.
2. (Chem. Physics) Pertaining to, or resembling, the electro-negative character of chlorine; hence, electro-negative; — opposed to basylous or zincous.