英 [mæg'niːʒə; -zɪə; -ʃə]
- magnesia (n.)
- 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.
- 1. The synthesis methods of magnesia - alumina spinel are electro - fusion and sintering process.
- 2. Township enterprises have a paper, agricultural machinery bearings, magnesia and other plants.
- 乡镇企业有造纸 、 农机轴承 、 镁砂等厂.
- 3. REVOLUTION IN DEVELOPMENT OF CHROME - FREE MAGNESIA - AND LOW CHROME HERCYNITE BRICKS.
- 4. A substance , such as magnesia or sodium bicarbonate, that neutralizes acid.
- 解酸的, 抗酸的,防酸的,中和酸的消除或中和酸度的, 尤其胃酸.
- 5. Magnesite deposits account for approximately 80 % of total magnesia production.
[ magnesia 造句 ]