sulfur (US) noun
or chiefly British sulphur /ˈsʌlfɚ/ or chiefly British sulphur /ˈsʌlfɚ/ Learner's definition of SULFUR
[noncount] chemistry
: a yellow chemical element that has a strong, unpleasant odor when it is burned and that is used in making paper, gunpowder, medicine, etc.硫;硫黄 Usage用法 In U.S. English, the spelling sulfur is chiefly used in technical writing, while both sulfur and sulphur are common in general writing.在美国英语中,sulfur这种拼写形式主要用于专业文献,而在一般文献中sulfur和sulphur这两种拼写均常用。