[ nuh-byoo-lee-uh m ]
/ nəˈbyu li əm /
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.
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Words nearby nebulium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences from the Web for nebulium
The whole thing aglow with the green light of nebulium and blazing with the stars behind it.Out Around Rigel|Robert H. Wilson