Sulphantimonious
Sulph`an`ti`mo´ni`ous
a. 1. (Chem.) Of, pertaining to, or designating, a hypothetical sulphacid of antimony (called also thioantimonious acid) analogous to sulpharsenious acid.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.