a pale-yellow, non-metallic chemical element found in crystalline or amorphous form, which burns with a blue flame and a stifling odour and is used in vulcanizing rubber and in making matches, paper, gunpowder, insecticides, sulphuric acid, etc. (symbol, S; at. wt., 32.064; at. no., 16; sp. gr. 2.07); sulphur; brimstone.