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Pronunciation varies by accent · noun
(chemistry) any oxide containing seven oxygen atoms in each molecule.
Use heptoxide when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Heptoxide means (chemistry) any oxide containing seven oxygen atoms in each molecule.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use heptoxide where its definition matches the intended context.
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