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From The Collaborative International Dictionary of English v.0.48:
Chlorous \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. [1913 Webster] 2. (Chem. Physics) Pertaining to, or resembling, the electro-negative character of chlorine; hence, electro-negative; -- opposed to basylous or zincous. [Obs.] [1913 Webster]