Dictionary.com

alumina

[ uh-loo-muh-nuh ]
/ əˈlu mə nə /
Save This Word!

noun
the natural or synthetic oxide of aluminum, Al2O3, occurring in nature in a pure crystal form as corundum.

COMPARE COMMONLY CONFUSED WORDS

These are smilar words, and share related meanings, but their uses are very different. Click on the buttons to learn more about these commonly confused words.
QUIZ
ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Question 1 of 8
Which of the following words describes “sky blue”?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help
Also called aluminum oxide.

Origin of alumina

1780–90; <Latin alūmin-, stem of alūmenalum1 + -a4
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use alumina in a sentence

British Dictionary definitions for alumina

alumina
/ (əˈluːmɪnə) /

noun
another name for aluminium oxide

Word Origin for alumina

C18: from New Latin, plural of Latin alūmen alum
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

Scientific definitions for alumina

alumina
[ ə-lōōmə-nə ]

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: Al2O3.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
FEEDBACK