noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The solid, Al₂O₃, commonly known as alumina; it occurs as bauxite, sapphire, ruby and other forms; it is used in the manufacture of ceramics uncountable
2. 2
   any of various forms of aluminum oxide occurring naturally as corundum wordnet

Synonyms

All synonyms

aluminaaluminum oxide