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Chemical element
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Molybdenum cube and fragment.


From New Latin molybdenum, from Ancient Greek μόλυβδος ‎(mólubdos, lead), because the two elements are so similar they were often confused.


molybdenum ‎(countable and uncountable, plural molybdenums or molybdena)

  1. A metallic chemical element (symbol Mo) with an atomic number of 42.
    • 1928, Lawrence R. Bourne, chapter 4, Well Tackled![1]:
      Technical terms like ferrite, perlite, graphite, and hardenite were bandied to and fro, and when Paget glibly brought out such a rare exotic as ferro-molybdenum, Benson forgot that he was a master ship-builder, […]
  2. A single atom of this element.
    a quadruple bond between molybdenums

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