alumina

noun

alu·mi·na | \ ə-ˈlü-mə-nə

How to pronounce alumina (audio)

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Definition of alumina

: the oxide of aluminum Al₂O₃ that occurs both in pure form as corundum and in hydrated forms (as in bauxite)

Examples of alumina in a Sentence

Recent Examples on the Web Producers refine an oxide from bauxite to create alumina, which is turned into aluminum metal at smelters. — Micah Maidenberg, WSJ, "Alcoa Incurs Loss, but Predicts Improved Demand," 15 Jan. 2020 Prices of alumina, which is extracted from bauxite, rose until 2018, reviving the mining industry. — The Economist, "Jamaica’s tumultuous relationship with the IMF has a happy ending," 9 Nov. 2019 Despite business-friendly rules, the recovery of foreign investment has been modest and, after a recent decline in alumina prices, may now falter. — The Economist, "Jamaica’s tumultuous relationship with the IMF has a happy ending," 9 Nov. 2019 Last year, there was as deficit of alumina, according to the company. — Micah Maidenberg, WSJ, "Alcoa’s Fourth-Quarter Revenue In Line With Expectations," 16 Jan. 2019 As Century paid a lot more for alumina, its profit margins were crushed even as aluminum prices surged. — Peter Eavis, New York Times, "These Companies Wanted Tariffs. How Are They Faring Now?," 10 July 2019 Authorities in Brazil ordered a huge alumina producer to operate at half capacity after a spill. — Peter Eavis, New York Times, "These Companies Wanted Tariffs. How Are They Faring Now?," 10 July 2019 Guinea is a hotbed of mining activity in recent months as aluminum firms from the U.S., China and Russia, try to carve out a piece of its massive bauxite-ore deposits used to produce alumina and aluminum. — Costas Paris, WSJ, "China’s Cosco Plans to Buy 25 Ships to Move Bauxite from Africa," 2 Nov. 2018 Raw materials including coke, which helps to fuel iron-ore smelters, and caustic soda, used to extract alumina from bauxite, are also rocketing higher in price. — Rhiannon Hoyle, WSJ, "What Goes Around Comes Around: Energy Prices Dig Into Miners’ Profits," 12 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'alumina.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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Cite this Entry

“Alumina.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/alumina. Accessed 7 Mar. 2021.

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More Definitions for alumina

alumina

noun

alu·mi·na | \ ə-ˈlü-mə-nə

\

Medical Definition of alumina

: an oxide of aluminum Al₂O₃ that occurs native as corundum and in hydrated forms (as in bauxite) and is used in antacids

— called also aluminum oxide

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