lanthanum
Pronunciation
  • enPR: lăn'thənəm, IPA: /ˈlænθənəm/

Noun

lanthanum

  1. (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.
  2. (countable) An atom of this element.
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