明矾 míngfán alum Origin Definitions Defs Strokes Stroke Words Sentences Sents 明 míng nounadjective bright bright; brilliant; light (as opposed to dark 暗 àn)矾 礬 fán alum Any of a group of hydrated double sulfate salts of certain metals, such as 明矾 míngfán, which are used in leather tanning, papermaking, and dyeing