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Mag"nes (?), n. [L.] Magnet.
[Obs.] Spenser.

Mag*ne"si*a (?; 277), n. [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, 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.

Mag*ne"sian (?), a. Pertaining to,
characterized by, or containing, magnesia or magnesium.

Magnesian limestone. (Min.) See
Dolomite.

Mag*ne"sic (?), a. (Chem.)
Pertaining to, or containing, magnesium; as, magnesic
oxide.

Mag"ne*site (?), n. [Cf. F.


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