GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       
Eu n. (Chem.) the chemical symbol for Europium, an element with atomic number 63 and atomic weight 151.96.

    Syn. -- Europium.

    [PJC]

    
      
    
  2.       
‖Eu (?). [Gr.  εὖ well, orig. neut. of εὔς good; prob. connected with Skr. su, from the same root as E. is; or with Skr. vasu good, prob. fr. the same root as E. was.] A prefix used frequently in composition, signifying well, good, advantageous; -- the opposite of dys-.

    [1913 Webster]

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