[ mag-nee-zhuh, -shuh ]
/ mægˈni ʒə, -ʃə /


a white, tasteless substance, magnesium oxide, MgO, used in medicine as an antacid and laxative.

Nearby words

  1. magnalium,
  2. magnanimity,
  3. magnanimous,
  4. magnanimously,
  5. magnate,
  6. magnesite,
  7. magnesium,
  8. magnesium arsenate,
  9. magnesium carbonate,
  10. magnesium hydroxide

Origin of magnesia

1350–1400; Middle English: philosophers' stone < Medieval Latin magnēsia < Greek () Magnēsía (líthos) (the stone) of Magnesia; sense development obscure

Related formsmag·ne·sian, adjective


[ mag-nee-shee-uh, -zhee-uh ]
/ mægˈni ʃi ə, -ʒi ə /


ancient name of Manisa. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for magnesia

British Dictionary definitions for magnesia


/ (mæɡˈniːʃə) /


another name for magnesium oxide
Derived Formsmagnesian, magnesic (mæɡˈniːsɪk) or magnesial, adjective

Word Origin for magnesia

C14: via Medieval Latin from Greek Magnēsia, of Magnēs ancient mineral-rich region

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

Word Origin and History for magnesia


Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for magnesia


[ măg-nēzhə ]


Magnesium oxide.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for magnesia


[ măg-nēzhə ]

A white powder with a very high melting point. It is used to make heat-resistant materials, electrical insulators, cements, fertilizer, and plastics. It is also used in medicine as an antacid and laxative. Chemical formula: MgO.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.