sulfur n 1: 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: {sulfur}, {S}, {sulphur}, {atomic number 16}] v 1: treat with sulphur in order to preserve; "These dried fruits are sulphured" [syn: {sulphur}, {sulfur}]