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magnesia

[mag-nee-zhuh, -shuh]
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noun
  1. a white, tasteless substance, magnesium oxide, MgO, used in medicine as an antacid and laxative.
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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

Magnesia

[mag-nee-shee-uh, -zhee-uh]
noun
  1. ancient name of Manisa.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for magnesia

magnesia

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

Word Origin

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

n.

late 14c., in alchemy, "main ingredient of the philosopher's stone," from Medieval Latin magnesia, from Greek (he) Magnesia (lithos) "the lodestone," literally "(the) Magnesian (stone)," from Magnesia, region in Thessaly, which is said to be named for the native people name Magnetes, which is of unknown origin. The ancient word, in this sense, has evolved into magnet. But in ancient times the same word, magnes, was used of lodestone as well as of a mineral commonly used in bleaching glass (modern pyrolusite, or manganese dioxide).

In Middle Ages there was some attempt to distinguish lodestone as magnes (masc.) and pyrolusite as magnesia (fem.). Meanwhile, in 18c., a white powder (magnesium carbonate) used as a cosmetic and toothpaste was sold in Rome as magnesia alba ("white magnesia"). It was from this, in 1808, that Davy isolated magnesium. He wanted to call it magnium, to stay as far as possible from the confused word magnesia, but the name was adopted in the form magnesium. Meanwhile from 16c. the other name of pyrolusite had been corrupted to manganese, and when, in 1774, a new element was isolated from it, it came to be called manganese.

Magnesia in its main modern sense of "magnesium oxide" (1755) is perhaps an independent formation from Latin magnes carneus "flesh-magnet" (c.1550), so called because it adheres strongly to the lips.

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Online Etymology Dictionary, © 2010 Douglas Harper

magnesia in Medicine

magnesia

(măg-nēzhə)
n.
  1. Magnesium oxide.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

magnesia in Science

magnesia

[măg-nēzhə]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.