(n) an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions), Syn. atomic number 16, S, sulphur
(n) a colorless toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions; causes acid rain, Syn. sulphur dioxide
(n) a colorless gas that is soluble in alcohol and ether; a powerful greenhouse gas widely used in the electrical utility industry, Syn. sulphur hexafluoride