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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Eurypterus  \Eu*ryp"te*rus\,  n.  [NL.,  fr  Gr  ?  broad  +  ?  a 
  wing.]  (Paleon.) 
  A  genus  of  extinct  Merostomata,  found  in  Silurian  rocks.  Some 
  of  the  species  are  more  than  three  feet  long.