alumina

[ uh-loo-muh-nuh ]
/ əˈlu mə nə /

noun

the natural or synthetic oxide of aluminum, Al2O3, occurring in nature in a pure crystal form as corundum.
Also called aluminum oxide.

Origin of alumina

1780–90; < Latin alūmin-, stem of alūmen alum1 + -a4

Words nearby alumina

alula, alum, alum rock, alum., alumin-, alumina, alumina cement, aluminate, aluminated, aluminiferous, aluminite

Example sentences from the Web for alumina

British Dictionary definitions for alumina

alumina
/ (əˈluːmɪnə) /

noun

another name for aluminium oxide

Word Origin for alumina

C18: from New Latin, plural of Latin alūmen alum

Scientific definitions for alumina

alumina
[ ə-lōō′mə-nə ]

Any of several forms of aluminum oxide used in aluminum production and in abrasives, refractories, ceramics, and electrical insulation. Alumina occurs naturally as the mineral corundum and, with minor traces of chromium and cobalt, as the minerals ruby and sapphire, respectively. In its hydrated form it also occurs as the rock bauxite. Also called aluminum oxide. Chemical formula: Al2O3.