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Pronunciation varies by accent · noun
Any atomic system containing a helium nucleus and an antihelium nucleus..
Use helionium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Helionium means Any atomic system containing a helium nucleus and an antihelium nucleus..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use helionium where its definition matches the intended context.
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