Sulphur occurs in volcanic and sedimentary deposits, as well as being a constituent of many minerals and petroleum. It is normally a bright yellow crystalline solid, but several other allotropic forms can be made. Sulphur is an ingredient of gunpowder, and is used in making matches and as an antiseptic and fungicide
Middle English: from Anglo-Norman French sulfre, from Latin sulfur, sulphur
The traditional British spelling is sulphur and the US spelling is sulfur. In chemistry and other technical uses, however, the -f- spelling is now the standard form for this and related words in British as well as US contexts, and is increasingly used in general contexts as well.