nebulium

American  

[nuh-byoo-lee-uhm] / nəˈbju 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.

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Etymology

Origin of nebulium

First recorded in 1895–1900; nebul(a) + -ium

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Example Sentences

See Examples For:

nebulium

Accordingly they created by mutual consent a new element, called it "nebulium," and doubted that it existed.

From Time Magazine Archive

Certain unfamiliar lines in the spectra of far off nebulae have long been thought by astronomers to be made by a mysterious element which they called nebulium.

From Time Magazine Archive

And what of that other unknown element we find glowing green in the far-flung nebulae—green as that we had just passed through—and that we call nebulium?

From The Moon Pool by Abraham Merritt

As soon as the stellar state is reached nebulium is no longer in evidence.

From Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 by Anonymous

The whole thing aglow with the green light of nebulium and blazing with the stars behind it.

From Out Around Rigel by Robert H. Wilson

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