| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024dys•pro•si•um (dis prō′sē əm, -shē-),USA pronunciation n. [Chem.]- Chemistrya rare-earth metallic element, highly reactive and paramagnetic, found in small amounts in various rare-earth minerals, as euxenite and monazite: used to absorb neutrons in nuclear reactors. Symbol: Dy;
at. wt.: 162.50;
at. no.: 66.
- Greek dysprós(itos) hard to get at (dys- dys- + pros- to + itós, past participle of iénai to go) + -ium
- Neo-Latin
- 1885–90
Collins Concise English Dictionary © HarperCollins Publishers:: dysprosium /dɪsˈprəʊsɪəm/ n - a soft silvery-white metallic element of the lanthanide series: used in laser materials and as a neutron absorber in nuclear control rods. Symbol: Dy; atomic no: 66; atomic wt: 162.50; valency: 3; relative density: 8.551; melting pt: 1412°C; boiling pt: 2567°C
Etymology: 20th Century: New Latin, from Greek dusprositos difficult to get near + -ium |