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Pronunciation varies by accent · adjective
(astronomy, of an object) Having a mass less than the minimum necessary mass for hydrogen fusion..
a substellar companion
Use substellar when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Substellar means (astronomy, of an object) Having a mass less than the minimum necessary mass for hydrogen fusion..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
a substellar companion
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