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sulfur
(also mainly British sulphur)
source: By Ben Mills - Own work, Public Domain

noun
1. the chemical element of atomic number 16, a yellow combustible nonmetal:
〘化〙 硫黄〘非金属元素; ｟記号｠ S〙
e.g. we should use coal which contains less sulfur
e.g. as modifier : the islands are also renowned for their thermal springs and sulfur baths. (Symbol: S)
the material of which hellfire and lightning were formerly believed to consist.
a pale greenish-yellow color:
硫黄［黄緑］色(sulfur yellow)
e.g. as modifier : the bird's sulfur-yellow throat.
>Sulfur 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. Sulfur is an ingredient of gunpowder, and is used in making matches and as an antiseptic and fungicide.
2. an American butterfly with predominantly yellow wings that may bear darker patches.
〘虫〙 モンキチョウ(sulfur butterfly)
>Colias, Phoebis, and other genera, family Pieridae.

verb with object
disinfect or fumigate with sulfur.
〘化〙 …を硫黄と化合させる, 硫化する

DERIVATIVES
sulfury |ˈsəlf(ə)rē| (also mainly British sulphury) adjective

ORIGIN
Middle English: from Anglo-Norman French sulfre, from Latin sulfur, sulphur.

USAGE
The standard US spelling is sulfur; sulphur is the traditional British spelling. However, the -f- spelling is now standard in scientific and technical writing in the UK, and is increasingly used in other contexts as well.