| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024mo•lyb•de•num /məˈlɪbdənəm/USA pronunciation n. [uncountable]- Chemistrya silver-white metal element, used with iron in making hard, high-speed cutting tools.
WordReference Random House Unabridged Dictionary of American English © 2024mo•lyb•de•num (mə lib′də nəm),USA pronunciation n. [Chem.]- Chemistrya silver-white metallic element, used as an alloy with iron in making hard, high-speed cutting tools. Symbol: Mo;
at. wt.: 95.94;
at. no.: 42;
sp. gr.: 10.2.
- Greek molýbdaina galena, equivalent. to mólybd(os) lead + -aina suffix of appurtenance
- Latin molybdaena
- Neo-Latin, alteration of earlier molybdēna
- 1810–20
Collins Concise English Dictionary © HarperCollins Publishers:: molybdenum /mɒˈlɪbdɪnəm/ n - a very hard ductile silvery-white metallic element occurring principally in molybdenite: used mainly in alloys, esp to harden and strengthen steels. Symbol: Mo; atomic no: 42; atomic wt: 95.94; valency: 2–6; relative density: 10.22; melting pt: 2623°C; boiling pt: 4639°C
Etymology: 19th Century: from New Latin, from Latin molybdaena galena, from Greek molubdaina, from molubdos lead |