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nebulium

Syllabification: ne·bu·li·um
Pronunciation: /nəˈbyo͞olēəm/

Entry from US English dictionary

Definition of nebulium in English:

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.

Definition of nebulium in:

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Word of the day tenebrous
Pronunciation: ˈtɛnɪbrəs
adjective
dark; shadowy or obscure