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]