The Collaborative International Dictionary
Sulphinic
Sulphinic \Sul*phin"ic\, a. (Chem.) Of, pertaining to, or designating, any one of a series of acids regarded as acid ethereal salts of hyposulphurous acid; as, methyl sulphinic acid, CH3.SO.OH, a thick unstable liquid.
Wiktionary
sulphinic
a. (alternative spelling of sulfinic English)