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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Magnesia \Mag*ne"si*a\ (?; 277), noun [L. Magnesia, fem. of Magnesius of the country Magnesia, Gr. h' Magnhsi'a li'qos a magnet. Cf. {Magnet}.] (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} [L.] (Med. Chem.), a bulky white amorphous substance, consisting of a hydrous basic carbonate of magnesium, and used as a mild cathartic.
From WordNet (r) 2.0 [wn]:
magnesia
noun: a white solid mineral that occurs naturally as periclase; a source of magnesium [syn: {periclase}, {magnesium oxide}]
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