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

The aluminum manufacturer is buying Alumina Limited in an all-stock deal valued at about $2.2 billion.

From Seattle Times • Feb. 26, 2024

Rusal has a 20% share in the Queensland Alumina Ltd refinery that has capacity of 3.95 million tonnes a year and therefore provides Rusal 790,000 tonnes a year, Patel said.

From Reuters • Mar. 21, 2022

On Monday, aluminum firm Sherwin Alumina filed for chapter 11 bankruptcy.

From Washington Post • Jan. 11, 2016

Youla had been the managing director of Guinea Alumina Corporation from 2004.

From US News • Dec. 27, 2015

Formula of Paste Zinc oxide 40% Whiting 30% Silica 20% Alumina and gypsum 10% Ground in 16% of linseed oilvehicle.

From Paint Technology and Tests by Gardner, Henry A.