magnesium

[mag-nee-zee-uhm, -zhuhm, -shee-uhm]
noun Chemistry.
a light, ductile, silver-white, metallic element that burns with a dazzling white light, used in lightweight alloys, flares, fireworks, in the manufacture of flashbulbs, optical mirrors, and precision instruments, and as a zinc substitute in batteries. Symbol: Mg; atomic weight: 24.312; atomic number: 12; specific gravity: 1.74 at 20°C.

Origin:
1800–10; < Neo-Latin; see magnesia, -ium

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World English Dictionary
magnesium (mæɡˈniːzɪəm)
 
n
a light silvery-white metallic element of the alkaline earth series that burns with an intense white flame, occurring principally in magnesite, dolomite, and carnallite: used in light structural alloys, flashbulbs, flares, and fireworks. Symbol: Mg; atomic no: 12; atomic wt: 24.3050; valency: 2; relative density: 1.738; melting pt: 650°C; boiling pt: 1090°C
 
[C19: New Latin, from magnesia]

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Etymonline
Word Origin & History

magnesium
1808 (Humphry Davy), from magnesia.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

magnesium mag·ne·si·um (māg-nē'zē-əm, -zhəm)
n.
Symbol Mg
A light metallic element that burns with a brilliant white flame. Atomic number 12; atomic weight 24.305; melting point 649°C; boiling point 1,090°C; specific gravity 1.74 (at 20°C); valence 2.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
magnesium   (māg-nē'zē-əm)  Pronunciation Key 
Symbol Mg
A lightweight, moderately hard, silvery-white metallic element of the alkaline-earth group that burns with an intense white flame. It is an essential component of chlorophyll and is used in lightweight alloys, flash photography, and fireworks. Atomic number 12; atomic weight 24.305; melting point 649°C; boiling point 1,090°C; specific gravity 1.74 (at 20°C); valence 2. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
One thing that had been suggested to me by a dentist was taking a magnesium
  supplement.
It is a good source of thiamine, magnesium and other minerals.
The next thing he knew was a blaze of white magnesium light, and a huge ball of
  fire.
Most of the remainder is metals such as aluminum, magnesium and calcium.
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