二硫化合物 èrliúhuàwù disulfide Origin Definitions Defs Strokes Stroke Words Sentences Sents 二 èr numeral two the number two; 2硫 liú sulfur (bound form) sulfur; a nonmetallic chemical element with the symbol S化合物 huàhéwù noun chemical compound a substance formed from two or more elements that are chemically combined in a fixed ratio