The Collaborative International Dictionary
Hydrosulphide
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.
Wiktionary
hydrosulphide
n. (context British English) (alternative spelling of hydrosulfide English)