What is of, pertaining to, or designating, a hypothetical sulphacid of antimony (called also thioantimonious acid) analogous to sulpharsenious acid called?

sulphantimonious — Of, pertaining to, or designating, a hypothetical sulphacid of antimony (called also thioantimonious acid) analogous to sulpharsenious acid. (Webster's 1913.)

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