Webster's English Dictionary

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molybdenum

Cross references:
  1. element               
 
mo.lyb.de.num \-n*m\ n [NL, fr. molybdena, a lead ore, molybdenite, 
   molybdenum, fr. L molybda]ena galena, fr. Gk molybdaina, fr. molybdos lead 
   : a polyvalent metallic element that resembles chromium and tungsten in ma 
   ny properties and is used in strengthening and hardening steel