alumina

Noun
  1. Any of various forms of aluminum oxide occurring naturally as corundum (synset 114848114)
    is a type of: corundom, corundum - very hard mineral used as an abrasive
    subtypes: alundum - a substance made of fused alumina
    substance meronym: furnace lining, refractory - lining consisting of material with a high melting point; used to line the inside walls of a furnace
    same as: aluminium oxide, aluminum oxide

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