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lanthanum

Pronunciation: /ˈlanθənəm/

Definition of lanthanum

noun

[mass noun]
  • the chemical element of atomic number 57, a silvery-white rare earth metal. (Symbol: La)

Origin:

mid 19th century: from Greek lanthanein 'escape notice' (because it was long undetected in cerium oxide) + -um

lanthanum in other Oxford dictionaries

Definition of lanthanum in the US English dictionary

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