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

Compare meaning

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

• alumina vs. aluminum

Example Sentences

It mines bauxite, the raw material for aluminum, refines it into alumina powder, and operates smelters that turn alumina to finished aluminum.

From Barron's

With smelters in the Persian Gulf typically holding around three to four weeks of alumina inventories, prolonged shipping disruptions could force them to further reduce output, tightening global markets significantly.

From The Wall Street Journal

“Most aluminum smelters only hold a few weeks’ supply of alumina, which could further tighten availability,” they add.

From The Wall Street Journal

The increase is modest because of alumina downgrades, Mozal’s coming closure and an unchanged price outlook for other commodities, Shaw says.

From The Wall Street Journal

Extended disruption in shipping through the Strait of Hormuz could choke alumina inflows and aluminum exports, tightening global supply meaningfully.

From The Wall Street Journal