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  1. Dictionary

    lan·thanum
    [ˈlanθənəm]
    noun
    lanthanum (noun)
    1. the chemical element of atomic number 57, a silvery-white rare earth metal.
    Origin
    mid 19th century: from Greek lanthanein ‘escape notice’ (because it was long undetected in cerium oxide) + -um.
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    WebApr 21, 2024 · rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first extended row of elements below …