Source : Webster's Revised Unabridged Dictionary (1913)

Antimonious \An`ti*mo"ni*ous\, a. (Chem.)
   Pertaining to, or derived from, antimony; -- said of those
   compounds of antimony in which this element has an
   equivalence next lower than the highest; as, antimonious
   acid.

Source : WordNet®

antimonious
     adj : relating to or derived from antimony; "antimonious oxide"
           [syn: {antimonic}]