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/ˈhæfniəm/ · noun
A chemical element (symbol Hf) with an atomic number of 72: a lustrous, silvery-grey tetravalent transition metal..
Use hafnium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Hafnium means A chemical element (symbol Hf) with an atomic number of 72: a lustrous, silvery-grey tetravalent transition metal..
Common synonyms include celtium, keltium, atomic number 72, hf.
The opposite depends on the specific sense.
Use hafnium where its definition matches the intended context.
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