Lanthanum Definition

lănthə-nəm
noun
A soft, malleable, silvery chemical element, one of the rare-earth elements and the first member of the lanthanide series: symbol, La; at. no. 57
Webster's New World
Synonyms:
  • atomic number 57
  • la

Origin of Lanthanum

  • New Latin from Greek lanthanein to escape notice (from the finding of the element hidden in oxide of cerium)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek λανθάνω (lanthanō, “escape notice"), because it had gone long undetected in mineral ores.

    From Wiktionary

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