alumina

[ uh-loo-muh-nuh ]

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

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Origin of alumina

1
1780–90; <Latin alūmin-, stem of alūmenalum1 + -a4
  • Also called aluminum oxide.

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British Dictionary definitions for alumina

alumina

/ (əˈluːmɪnə) /


noun
  1. another name for aluminium oxide

Origin of alumina

1
C18: from New Latin, plural of Latin alūmen alum

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for alumina

alumina

[ ə-lōōmə-nə ]


  1. 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.

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