| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024mag•ne•si•um /mægˈniziəm, -ʒəm, -ʃiəm/USA pronunciation n. [uncountable]- Chemistrya light, silver-white element that burns with a dazzling light, used in fireworks and flashbulbs.
WordReference Random House Unabridged Dictionary of American English © 2024mag•ne•si•um (mag nē′zē əm, -zhəm, -shē əm),USA pronunciation n. [Chem.]- Chemistrya light, ductile, silver-white, metallic element that burns with a dazzling white light, used in lightweight alloys, flares, fireworks, in the manufacture of flashbulbs, optical mirrors, and precision instruments, and as a zinc substitute in batteries. Symbol: Mg;
at. wt.: 24.312;
at. no.: 12;
sp. gr.: 1.74 at 20°C.
- Neo-Latin; see magnesia, -ium
- 1800–10
Collins Concise English Dictionary © HarperCollins Publishers:: magnesium /mæɡˈniːzɪəm/ n - a light silvery-white metallic element of the alkaline earth series that burns with an intense white flame, occurring principally in magnesite, dolomite, and carnallite: used in light structural alloys, flashbulbs, flares, and fireworks. Symbol: Mg; atomic no: 12; atomic wt: 24.3050; valency: 2; relative density: 1.738; melting pt: 650°C; boiling pt: 1090°C
Etymology: 19th Century: New Latin, from magnesia |