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Pronunciation varies by accent · noun
(astronomy, physics, obsolete) A supposed chemical 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..
Use nebulium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Nebulium means (astronomy, physics, obsolete) A supposed chemical 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..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use nebulium where its definition matches the intended context.
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