Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A supposed element proposed as a result of spectral analysis of light from a nebula; the emission lines concerned are now known to be due to doubly-ionized oxygen

from The Century Dictionary and Cyclopedia

  • n. A supposed gaseous element assumed to account for the brilliant green lines in the spectrum of the nebulæ. Thus far it has not been detected on the earth, or in any of the heavenly bodies except the nebulæ.

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