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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Eurypteroidea  \Eu*ryp`te*roi"de*a\,  n.  pl  [NL.  See 
  {Eurypteroid}.]  (Paleont.) 
  An  extinct  order  of  Merostomata,  of  which  the  genus 
  Eurypterus  is  the  type  They  are  found  only  in  Paleozoic 
  rocks.  [Written  also  {Eurypterida}.]