二氧化硅 èryǎnghuàguī silicon dioxide Origin Definitions Defs 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)硅 guī proper nounnoun silicon silicon (Si); a non-metallic element used as a semiconductor and in the manufacturing of cement and glass