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/ˈlænθənəm/ · noun
(uncountable) A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air..
Use lanthanum 1 when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Lanthanum 1 means (uncountable) A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air..
Common synonyms include La, la, atomic number 57.
The opposite depends on the specific sense.
Use lanthanum 1 where its definition matches the intended context.
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