二氧化硫 èryǎnghuàliú sulfur dioxide Definitions Defs Origin Strokes Stroke Words Sentences Sents 二 èr numeral two the number two; 2氧化 yǎnghuà noun oxidize; oxidation to combine with oxygen; the chemical process of losing electrons (as in rusting or combustion)硫 liú sulfur (bound form) sulfur; a nonmetallic chemical element with the symbol S