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Pronunciation varies by accent · noun
(dated) The unstable, radioactive, chemical element with atomic number 118, now named oganesson..
Use eka-radon when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Eka-radon means (dated) The unstable, radioactive, chemical element with atomic number 118, now named oganesson..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use eka-radon where its definition matches the intended context.
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