emery

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a hard grey-black mineral consisting of corundum and either hematite or magnetite;
used as an abrasive (especially as a coating on paper)
• Hypernyms:
mineral
• Substance Holonyms:
emery paper, sandpaper
• Substance Meronyms:
corundom, corundum, hematite, haematite, magnetite, magnetic iron-ore