mag·ne·sia /mægˈniʃə, ʒə/
mag·ne·sia /mægˈnɪʃə, ˈnɪʒə/ 名詞
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.
n : a white solid mineral that occurs naturally as periclase; a
source of magnesium [syn: periclase, magnesium oxide]