SULFUR
sulfur, sulphur, atomic number
(noun) an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)
sulphur, sulfur
(verb) treat with sulphur in order to preserve; “These dried fruits are sulphured”
Source: WordNet® 3.1
Etymology
Noun
sulfur (usually uncountable, plural sulfurs)
(uncountable) A chemical element (symbol S) with an atomic number of 16.
Synonym: brimstone (archaic, not in technical usage)
Hypernym: chalcogen
(countable, uncountable) A yellowish green colour, like that of sulfur.
Adjective
sulfur (comparative more sulfur, superlative most sulfur)
Of a yellowish green colour, like that of sulfur.
Verb
sulfur (third-person singular simple present sulfurs, present participle sulfuring, simple past and past participle sulfured)
(transitive) To treat with sulfur, or a sulfur compound, especially to preserve or to counter agricultural pests.
Source: Wiktionary