mag·ne·sium /mægˈniziəm, ʒəm/
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 mag·ne·sium /mægˈnɪzɪəm, ʒəm/ 名詞
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 Mag·ne·si·um n.  Chem. A light silver-white metallic element of atomic number 12, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc.  Symbol Mg.  Atomic weight, 24.305.  Specific gravity, 1.75.
 Magnesium sulphate. Chem. Same as Epsom salts.
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 magnesium
      n : a light silver-white ductile bivalent metallic element; in
          pure form it burns with brilliant white flame; occurs
          naturally only in combination (as in magnesite and
          dolomite and carnallite and spinel and olivine) [syn: Mg,
           atomic number 12]
 magnesium
 Symbol: Mg
 Atomic number: 12
 Atomic weight: 24.312
 Silvery metallic element belonging to group 2 of the periodic table
 (alkaline-earth metals). It is essential for living organisms, and is used
 in a number of light alloys. Chemically very reactive, it forms a
 protective oxide coating when exposed to air and burns with an intense
 white flame. It also reacts with sulphur, nitrogen and the halogens. First
 isolated by Bussy in 1828.