alumina

American  

[uh-loo-muh-nuh] / əˈlu mə nə /

noun

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

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alumina British  

/ əˈluːmɪnə /

noun

1. another name for aluminium oxide

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alumina Scientific  

/ 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 .

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Etymology

Origin of alumina

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

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Compare meaning

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

• alumina vs. aluminum

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Example Sentences

See Examples For:

alumina

Falling Japanese aluminium premiums as well as rising alumina and carbon anode costs could further squeeze smelting margins in 2H.

From The Wall Street Journal ● Oct. 26, 2026

However, moving alumina into the region and shipping finished metal out remain potential bottlenecks, as supply chains remain exposed to renewed disruptions.

From The Wall Street Journal ● Oct. 22, 2026

The company produced 6.1 million tons of alumina in 2025.

From The Wall Street Journal ● Oct. 6, 2026

Production in Ireland was launched in 1983, and the company says it produces around 1.9 million tonnes of alumina a year at the plant.

From Barron's ● Jul. 24, 2026

The hones yield on analysis 98% of silica, with small proportions of alumina, potash and soda, and mere traces of iron, lime, magnesia and fluorine.

From Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" by Various

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