| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024thu•li•um (tho̅o̅′lē əm),USA pronunciation n. [Chem.]- Chemistrya rare-earth metallic element found in the minerals euxenite, gadolinite, etc. Symbol: Tm;
at. wt.: 168.934;
at. no.: 69;
sp. gr.: 9.32.
- Neo-Latin; see Thule, -ium
- 1875–80
Collins Concise English Dictionary © HarperCollins Publishers:: thulium /ˈθjuːlɪəm/ n - a malleable ductile silvery-grey element occurring principally in monazite. The radioisotope thulium-170 is used as an electron source in portable X-ray units. Symbol: Tm; atomic no: 69; atomic wt: 168.93421; valency: 3; relative density: 9.321; melting pt: 1545°C; boiling pt: 1950°C
Etymology: 19th Century: New Latin, from Thule + -ium |