| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024be•ryl•li•um /bəˈrɪliəm/USA pronunciation n. [uncountable]- Chemistrya hard, light metallic element, used chiefly to reduce fatigue in springs and electrical contacts.
WordReference Random House Unabridged Dictionary of American English © 2024be•ryl•li•um (bə ril′ē əm),USA pronunciation n. [Chem.]- Chemistrya steel-gray, bivalent, hard, light, metallic element, the salts of which are sweet: used chiefly in copper alloys for better fatigue endurance, in springs, and in electrical contacts. Symbol: Be;
at. wt.: 9.0122;
at. no.: 4;
sp. gr.: 1.8 at 20° C.
- Latin bēryll(us) beryl + -ium
- 1860–65
Collins Concise English Dictionary © HarperCollins Publishers:: beryllium /bɛˈrɪlɪəm/ n - a corrosion-resistant toxic silvery-white metallic element that occurs chiefly in beryl and is used mainly in X-ray windows and in the manufacture of alloys. Symbol: Be; atomic no: 4; atomic wt: 9.012; valency: 2; relative density: 1.848; melting pt: 1289°C; boiling pt: 2472°C
Etymology: 19th Century: from Latin bēryllus, from Greek bērullos |