| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024thal•li•um (thal′ē əm),USA pronunciation n. [Chem.]- Chemistrya soft, malleable, rare, bluish-white metallic element: used in the manufacture of alloys and, in the form of its salts, in rodenticides. Symbol: Tl;
at. wt.: 204.37;
at. no.: 81;
sp. gr.: 11.85 at 20°C.
- Greek thallós green stalk) + -ium -ium; named after green line in its spectrum
- Neo-Latin, equivalent. to thall- (
- 1860–65
Collins Concise English Dictionary © HarperCollins Publishers:: thallium /ˈθælɪəm/ n - a soft malleable highly toxic white metallic element used as a rodent and insect poison and in low-melting glass. Its compounds are used as infrared detectors and in photoelectric cells. Symbol: Tl; atomic no: 81; atomic wt: 204.3833; valency: 1 or 3; relative density: 11.85; melting pt: 304°C; boiling pt: 1473±10°C
Etymology: 19th Century: from New Latin, from Greek thallos a green shoot; referring to the green line in its spectrum |