| a white, tasteless substance, magnesium oxide, MgO, used in medicine as an antacid and laxative. |

magnesia mag·ne·sia (māg-nē'zhə, -shə)
n.
Magnesium oxide.
| magnesia (māg-nē'zhə) Pronunciation Key
A white powder with a very high melting point. It is used to make heat-resistant materials, electrical insulators, cements, fertilizer, and plastics. It is also used in medicine as an antacid and laxative. Chemical formula: MgO. |