- a white, tasteless substance, magnesium oxide, MgO, used in medicine as an antacid and laxative.
Origin of magnesia
- ancient name of Manisa.
Examples from the Web for magnesia
Then she poured Milk of Magnesia into the other glass as a chaser.The Making of Madoff
August 1, 2009
But so, too, would water impregnated by the sulphate of magnesia or the sulphate of soda.The Desert Home
It is composed of silica, alumina, carbonate of lime, magnesia and oxide of iron.Museum of Antiquity
L. W. Yaggy
Would she hand that one this bit of magnesia for his heartburn?The Red Acorn
Sulphate of Magnesia is found in Kentucky, Indiana, and perhaps other states.A New Guide for Emigrants to the West
J. M. Peck
If any aid is needed, milk of magnesia is the best laxative.The Eugenic Marriage, Volume IV. (of IV.)
- another name for magnesium oxide
Word Origin and History for magnesia
late 14c., in alchemy, "main ingredient of the philosopher's stone," from Medieval Latin magnesia, from Greek (he) Magnesia (lithos) "the lodestone," literally "(the) Magnesian (stone)," from Magnesia, region in Thessaly, which is said to be named for the native people name Magnetes, which is of unknown origin. The ancient word, in this sense, has evolved into magnet. But in ancient times the same word, magnes, was used of lodestone as well as of a mineral commonly used in bleaching glass (modern pyrolusite, or manganese dioxide).
In Middle Ages there was some attempt to distinguish lodestone as magnes (masc.) and pyrolusite as magnesia (fem.). Meanwhile, in 18c., a white powder (magnesium carbonate) used as a cosmetic and toothpaste was sold in Rome as magnesia alba ("white magnesia"). It was from this, in 1808, that Davy isolated magnesium. He wanted to call it magnium, to stay as far as possible from the confused word magnesia, but the name was adopted in the form magnesium. Meanwhile from 16c. the other name of pyrolusite had been corrupted to manganese, and when, in 1774, a new element was isolated from it, it came to be called manganese.
Magnesia in its main modern sense of "magnesium oxide" (1755) is perhaps an independent formation from Latin magnes carneus "flesh-magnet" (c.1550), so called because it adheres strongly to the lips.
- Magnesium oxide.
- 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.