GNU Collaborative International Dictionary of English

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1.       
   Molybdenum (?), n. [NL.: cf. F. molybdène. See Molybdena.] (Chem.) A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal.  Symbol Mo.  Atomic number 42. Atomic weight 95.94.
   
   [1913 Webster +PJC]