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From: Webster's Revised Unabridged Dictionary (1913)

 Mag·ne·si·a n.  Chem. A light earthy white substance, consisting of magnesium oxide (MgO), and obtained by heating magnesium hydrate or carbonate, or by burning magnesium.  It has a slightly alkaline reaction, and is used in medicine as a mild antacid laxative. See Magnesium.
 Magnesia alba  Med. Chem., a bulky white amorphous substance, consisting of a hydrous basic carbonate of magnesium, and used as a mild cathartic.
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