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[nuh-byoo-lee-uh m] /nəˈbyu li əm/
noun, 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.
Origin of nebulium
First recorded in 1895-1900; nebul(a) + -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Historical Examples
  • The whole thing aglow with the green light of nebulium and blazing with the stars behind it.

    Out Around Rigel Robert H. Wilson

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