The Collaborative International Dictionary
Chlorous \Chlo"rous\, a. [See Chlorine.]
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.
(Chem. Physics) Pertaining to, or resembling, the electro-negative character of chlorine; hence, electro-negative; -- opposed to basylous or zincous.
Wiktionary
a. 1 (context chemistry English) Of a compound, containing chlorine with a lower oxidation number than equivalent chloric compounds; especially having an oxidation number of 3. 2 (context obsolete English) Relating to, or resembling, the electronegative character of chlorine; hence, electronegative; opposed to (term: basylous) or (term: zincous).
WordNet
Wikipedia
Usage examples of "chlorous".
I fed a little chlorous acid into the tank and the Columbine followed her up eagerly, the infra-calyxes warbling delicate variations on the treble clef.