Magnesia

n.

1.

(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.

Noun

1.

magnesia - a white solid mineral that occurs naturally as periclase; a source of magnesium Synonyms: magnesium oxide, periclase

atomic number 12, magnesium, magnesium oxide, Mg, mineral, periclase