lanthanum
/ˈlænθənəm/
noun 2
Definitions
noun
1
A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.
2
An atom of this element.
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noun
A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.
An atom of this element.