Hydrosulphide /(?)/

Hy·dro·sul·phide

Hydrosulphide

n.
  1. 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. (Chem.)