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/pɹoʊˈmiːθiəm/ · noun
A metallic chemical element (symbol Pm) with an atomic number of 61..
Use promethium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Promethium means A metallic chemical element (symbol Pm) with an atomic number of 61..
Common synonyms include cyclonium, florentium, illinium, pm.
The opposite depends on the specific sense.
Use promethium where its definition matches the intended context.
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