Webster's English Dictionary

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radium

Cross references:
  1. element               
 
ra.di.um \'ra-d-e--*m\ n [NL, fr. L radius ray] often attrib  : an 
   intensely radioactive shining white metallic element that resembles b arium 
   chemically, occurs in combination in minute quantities in minerals (as 
   pitchblende or carnotite), emits alpha particles and gamma rays to form 
   radon, and is used chiefly in luminous materials and in the treatment of 
   cancer