[mass noun]a greyish-black form of corundum containing iron oxide or other impurities, used in powdered form as an abrasive (作磨料用的)刚玉粉,金刚砂 ■[as modifier]denoting materials coated with emery for polishing, smoothing, or grinding (打磨材料)涂金刚砂的 emery paper. 砂纸。
语源
late 15th cent.: from French émeri, from Old French esmeri, from Italian smeriglio, based on Greek smuris, smiris 'polishing powder'