Webster's English Dictionary

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uranium

Cross references:
  1. element               
 
ura.ni.um \yu.-'ra--ne--*m\ n [NL, fr. Uranus] often attrib  : a silvery 
   heavy radioactive polyvalent metallic element that is found es p. in 
   pitchblende and uraninite and exists naturally as a mixture of three 
   isotopes of mass number 234, 235, and 238 in the proportions of 0.006 
   percent, 0.71 percent, and 99.28 percent respectively