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emery (n.)

granular mixture used as an abrasive, late 15c., from Middle French émeri, from Old French esmeril, from Italian smeriglo, from Vulgar Latin *smyrilium, from Greek smyris "abrasive powder" used for rubbing and polishing, probably a non-Greek word, perhaps from a Semitic source. Emery board attested from 1725.

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Definitions of emery from WordNet

emery (n.)
a hard grey-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper);
From wordnet.princeton.edu