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Lanthanum

//ˈlænθənəm// noun

Definitions

Noun
  1. 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. uncountable
  2. 2
    a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth wordnet
  3. 3
    An atom of this element. countable

Etymology

From Ancient Greek λανθάνω (lanthánō, “to escape notice”) + -um (“a chemical element”), because it had gone long undetected in mineral ores.

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