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magnesium (n.)

silvery-white metallic element, 1808, coined by English chemist Sir Humphrey Davy from the white alkaline earth magnesia (q.v.), in which it was found. With metallic element ending -ium.

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Definitions of magnesium from WordNet

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);
Synonyms: Mg / atomic number "
From wordnet.princeton.edu