(uncountable) A chemical element (symbol S) with an atomic number of 16.

(countable, uncountable) A yellowish green colour, like that of sulfur.

Any of various pierid butterflies of the subfamily Coliadinae, especially the sulfur-coloured species.

(transitive) To treat with sulfur, or a sulfur compound, especially to preserve or to counter agricultural pests.

Of a yellowish green colour, like that of sulfur.