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A light earthy white substance, consisting of magnesium oxide, 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 antac…

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  1. n. A light earthy white substance, consisting of magnesium oxide, 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.
  2. n. a white solid mineral that occurs naturally as periclase; a source of magnesium
  3. n a white solid mineral that occurs naturally as periclase; a source of magnesium