五氧化二钒 wǔyǎnghuà'èrfán vanadium pentoxide Origin Definitions Defs Strokes Stroke Words Sentences Sents 五 wǔ numeral five the number five; 5氧化 yǎnghuà noun oxidize; oxidation to combine with oxygen; the chemical process of losing electrons (as in rusting or combustion)二 èr numeral two the number two; 2钒 釩 fán vanadium vanadium; the chemical element with the symbol V