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nebulium

[nuh-byoo-lee-uh m] /nəˈbyu li əm/
noun, Astronomy
1.
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
1895-1900
1895-1900; nebul(a) + -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for nebulium
  • These lines defied explanation for over fifty years, lending speculation they were due to a new element, which was named nebulium.

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