sulfur

¹sul·fur

noun

Definition of SULFUR

: a nonmetallic element that occurs either free or combined especially in sulfides and sulfates, is a constituent of proteins, exists in several allotropic forms including yellow orthorhombic crystals, resembles oxygen chemically but is less active and more acidic, and is used especially in the chemical and paper industries, in rubber vulcanization, and in medicine for treating skin diseases—symbol S; see element table

Variants of SULFUR

sul·fur or chiefly British sul·phur \ˈsəl-fər\