alu·​mi·​na | \ ə-ˈlü-mə-nə How to pronounce alumina (audio) \

Definition of alumina

: the oxide of aluminum Al2O3 occurring native as corundum and in hydrated forms (as in bauxite)

Examples of alumina in a Sentence

Recent Examples on the Web 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 Below that sits an alumina-zircon-silica nozzle, which can programmed to make the same intricate moves in X-, Y-, and Z-space familiar to anyone who has seen a 3D printer in action. Jake Swearingen, Popular Mechanics, "MIT Creates a 3D Printer for Glass," 21 Aug. 2015 Bloomberg News reported that Rusal officials met Chinese companies and traders this week to discuss the possibility of buying alumina and selling aluminum in the Asian country. David Hodari, WSJ, "Wanted: New Home for a Lot of Russian Aluminum," 20 Apr. 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.

See More

First Known Use of alumina

circa 1790, in the meaning defined above

History and Etymology for alumina

New Latin, from Latin alumin-, alumen alum

Keep scrolling for more

Learn More about alumina

Time Traveler for alumina

Time Traveler

The first known use of alumina was circa 1790

See more words from the same year

Statistics for alumina

Cite this Entry

“Alumina.” The Dictionary, Merriam-Webster Inc., Accessed 21 January 2020.

Keep scrolling for more

More Definitions for alumina


alu·​mi·​na | \ ə-ˈlü-mə-nə How to pronounce alumina (audio) \

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

More from Merriam-Webster on alumina Encyclopedia article about alumina

Comments on alumina

What made you want to look up alumina? Please tell us where you read or heard it (including the quote, if possible).


good-natured easy friendliness

Get Word of the Day daily email!

Test Your Vocabulary

Intact Latin Quiz

  • roman tablet
  • What did focus mean in Latin?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!