Definition of nebulium in English:

nebulium

noun

Chemistry
historical
  • A hypothetical chemical element proposed in the 1860s to explain certain lines in the spectra of nebulae, later discovered to arise from forbidden transitions in oxygen and nitrogen ions.

    as modifier ‘nebulium lines’
    • ‘They called this unknown ‘new’ element nebulium, but modern astronomy has since shown it to be a rare form of superheated oxygen.’
    • ‘He proposed that a new and unknown element, ‘nebulium’, was responsible for these lines.’
    • ‘Coronium and nebulium were both, in the event, figments of the astronomers' imaginations.’
    • ‘The hypothetical nebulium was simply the signature of ordinary oxygen doing extraordinary things.’
    • ‘And, in the twentieth century, we learned that nebulium was actually ionized oxygen and nitrogen.’

Origin

Late 19th century: from nebula + -ium.

Pronunciation

nebulium

/nɛˈbjuːlɪəm/