lanthanum
noun/ˈlænθənəm/
/ˈlænθənəm/
[uncountable] (symbol La)
- a chemical element. Lanthanum is a silver-white metal.Word Originmid 19th cent.: from Greek lanthanein ‘escape notice’ (because for a long time it was undetected in cerium oxide) + -um.
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lanthanum