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/pəˈləʊ.nɪ.əm/ · noun
A rare, highly radioactive chemical element (symbol Po) with atomic number 84..
Use polonium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Polonium means A rare, highly radioactive chemical element (symbol Po) with atomic number 84..
Common synonyms include po, atomic number 84.
The opposite depends on the specific sense.
Use polonium where its definition matches the intended context.
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