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

alumina

/ ə-lo̅o̅′mə-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 .

Word History and Origins

Origin of alumina¹

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

Word History and Origins

Origin of alumina¹

C18: from New Latin, plural of Latin alūmen alum

Example Sentences

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg