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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.

alumina British  
/ 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 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 .

Etymology

Origin of alumina

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

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

However, although aluminum prices have been supported by stable alumina costs, the analyst notes that it could be partially held back by recent geopolitical uncertainties, which could weigh on demand.

From The Wall Street Journal

Alcoa has operated a refinery there since the 1980s that processes bauxite to make alumina.

From The Wall Street Journal

Canada ranks as one of the world’s major producers of primary aluminum, although its refineries and smelters rely on imports of what is known as smelter-grade alumina.

From The Wall Street Journal

Lower alumina prices and new capacity coming onstream are expected to sustain cost advantages, he adds.

From The Wall Street Journal

This year, alumina shipments are expected to be between 11.8 and 12 million tons.

From The Wall Street Journal

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.