| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024rhe•ni•um (rē′nē əm),USA pronunciation n. [Chem.]- Chemistrya rare metallic element of the manganese subgroup: used, because of its high melting point, in platinum-rhenium thermocouples. Symbol: Re;
at. no.: 75;
at. wt.: 186.2.
- Neo-Latin, equivalent. to Latin Rhēn(us) Rhine + -ium -ium
- 1920–25
Collins Concise English Dictionary © HarperCollins Publishers:: rhenium /ˈriːnɪəm/ n - a dense silvery-white metallic element that has a high melting point. It occurs principally in gadolinite and molybdenite and is used, alloyed with tungsten or molybdenum, in high-temperature thermocouples. Symbol: Re; atomic no: 75; atomic wt: 186.207; valency: –1 or 1–7; relative density: 21.02; melting pt: 3186°C; boiling pt: 5596°C (est)
Etymology: 19th Century: New Latin, from Rhēnus the Rhine |