nebulium 的定义
Astronomy.
- a hypothetical element once thought to be present in emission nebulae because of certain unidentified spectral lines, now known to be forbidden transitions of oxygen and nitrogen ions.
更多nebulium例句
- The whole thing aglow with the green light of nebulium and blazing with the stars behind it.
- The other element, to which he gives the name Nebulium, will have an atomic weight of 2·1.