emery
/ˈemərɪ/noun
mass noun
1- 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。
1.1
- 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。
词源
late 15th cent.: from French émeri, from Old French esmeri, from Italian smeriglio, based on Greek smuris, smiris 'polishing powder'.