a. - 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.
a. - Pertaining to, or resembling, the electro-negative
character of chlorine; hence, electro-negative; -- opposed to basylous
or zincous.