əˈlümənə noun
( -s )
Etymology: New Latin, from Latin alumin-, alumen
: the oxide of aluminum Al 2 O 3 that occurs native as corundum and in hydrated forms, that is made usually from bauxite, in various forms (as a white powder obtained by calcination or a hard crystalline substance resembling natural corundum obtained by heating calcined aluminum oxide almost to the fusion point), and that is used chiefly as a source of metallic aluminum, as an abrasive and refractory, as a catalyst and catalyst carrier, and as an adsorbent (as in drying gases and liquids and in chromatography) — see aluminum hydroxide