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/ˈθɔːɹiəm/ · noun
A chemical element (symbol Th) with atomic number 90. A weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air..
Use thorium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Thorium means A chemical element (symbol Th) with atomic number 90. A weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air..
Common synonyms include thorinum, th, atomic number 90.
The opposite depends on the specific sense.
Use thorium where its definition matches the intended context.
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