The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
antimonious adj 1: relating to or derived from antimony; "antimonious oxide" [syn: antimonic, antimonious]