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

The gas "nebulium," not yet found on the earth, is the most characteristic constituent of irregular nebulæ.

From The New Heavens by George Ellery Hale

When this nebula is observed with a slitless spectrograph the hydrogen and nebulium components are seen as circular discs, but the hydrogen discs are larger than the nebulium discs.

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

In other words, the hydrogen forms an atmosphere about the central star which extends out into space in all directions a great deal farther than the nebulium discs extend.

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

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