hydrogen sulphide

Wiktionary

1. n. alternative spelling of hydrogen sulfide.

GNU Webster's 1913

1. n. a colorless inflammable gas, H2S, having the characteristic odor of bad eggs, and found in many mineral springs. It is produced by the action of acids on metallic sulphides, and is an important chemical reagent. Called also sulphureted hydrogen.
2. n. See under Hydrogen.