Preceded by distinguishing words: a particular phosphorescent substance. See also Bologna phosphorus n.… calcined calcium sulphide.

hydrogen sulphide, sulphide of hydrogen, sulphuretted hydrogen, H2S. (Also attrib.)

A salt or other compound which contains two or more sulphur atoms bonded together as an anion or group; (also) such an anion or group.

A compound of an element or radical with three atoms of sulphur; e.g. boron trisulphide, B2S3; arsenic trisulphide, As2S3; potassium trisulphide…