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The Collaborative International Dictionary of English v.0.48 (gcide)

Hydrosulphide \Hy`dro*sul"phide\, n. (Chem.)
One of a series of compounds, derived from hydrogen sulphide
by the replacement of half its hydrogen by a base or basic
radical; as, potassium hydrosulphide, {KSH}. The
hydrosulphides are analogous to the hydrates and include the
mercaptans.
[1913 Webster]


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.
[1913 Webster]