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Pronunciation varies by accent · noun
(astronomy) A large region carved out of the interstellar medium by the combination of several supernova shells, leading to a lower density of gas and plasma within than without, larger than any single supernova could create..
Use supershell when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Supershell means (astronomy) A large region carved out of the interstellar medium by the combination of several supernova shells, leading to a lower density of gas and plasma within than without, larger than any single supernova could create..
Common synonyms include superbubble.
The opposite depends on the specific sense.
Use supershell where its definition matches the intended context.
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