二氧化矽 èryǎnghuàxìèryǎnghuàxī 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)矽 xì silicon silicon; chemical element with atomic number 14; term used primarily in Taiwan or as an older name in Mainland China for 硅 guī