Source : Webster's Revised Unabridged Dictionary (1913)

Sulphydrate \Sul*phy"drate\, n. (Chem.)
   A compound, analogous to a hydrate, regarded as a salt of
   sulphydric acid, or as a derivative of hydrogen sulphide in
   which one half of the hydrogen is replaced by a base (as
   potassium sulphydrate, {KSH}), or as a hydrate in which the
   oxygen has been wholly or partially replaced by sulphur.