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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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