Emily Dickinson Lexicon

MAG-NE'SIA, n. [s as z. Fr. magnesie. Qu. from Magnesia, the place where first found. Lunier says, from Gr. μαγνης, the lodestone; but the reason he does not assign.]

A primitive earth, having for its base a metallic substance, called magnesium. It is generally found in combination with other substances. It is antacid, and moderately cathartic. Ure.