The Collaborative International Dictionary of English v.0.48:

Sulphine \Sul"phine\, n. (Chem.)
   Any one of a series of basic compounds which consist
   essentially of sulphur united with hydrocarbon radicals. In
   general they are oily or crystalline deliquescent substances
   having a peculiar odor; as, trimethyl sulphine,
   (CH3)3S.OH. Cf. Sulphonium.
   [1913 Webster]