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alumina

[ uh-loo-muh-nuh ]

noun

  1. the natural or synthetic oxide of aluminum, Al 2 O 3 , occurring in nature in a pure crystal form as corundum.


alumina

/ əˈluːmɪnə /

noun

  1. another name for aluminium oxide
“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


alumina

/ ə-lo̅o̅mə-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: Al 2 O 3 .


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Word History and Origins

Origin of alumina1

1780–90; < Latin alūmin-, stem of alūmen alum 1 + -a 4
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Word History and Origins

Origin of alumina1

C18: from New Latin, plural of Latin alūmen alum
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Compare Meanings

How does alumina compare to similar and commonly confused words? Explore the most common comparisons:

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Example Sentences

They are made largely from simulated moon dust, or “regolith,” which includes compounds like silica and alumina.

To this are added 250 parts by weight of washed gelatinous alumina.

The alumina is dissolved in sulphuric acid, leaving the silica.

The ash should then be submitted to the various reagents in order to detect lime, alumina, &c.

Sulphydrate of ammonium precipitates alumina from these solutions:—7.

By decomposing a solution of crude sulphate of alumina with neutral or monobasic acetate of lead.

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alumin-alumina cement