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Definition of Sulphophosphoric
1. a. Of, pertaining to, or designating, a hypothetical sulphacid of phosphorus, analogous to phosphoric acid, and known in its salts.
Definition of Sulphophosphoric
1. Adjective. (chemistry) Of, pertaining to, or designating a hypothetical thioacid of phosphorus, analogous to phosphoric acid, and known only in its salts. ¹
¹ Source: wiktionary.com