emery

Từ điển Oxford Advanced Learner 8th

emery BrE [ˈeməri] NAmE [ˈeməri] noun uncountable
a hard mineral used especially in powder form for polishing things and making them smooth

Word Origin:
[emery] late 15th cent.: from French émeri, from Old French esmeri, from Italian smeriglio, based on Greek smuris, smiris ‘polishing powder’.