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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Cycloidei  \Cy*cloi"de*i\  (s?-kloi"d?-?),  n.  pl  [NL.,  fr  Gr 
  ky`klos  circle  +  -oid.]  (Zo["o]l.) 
  An  order  of  fishes,  formerly  proposed  by  Agassiz,  for  those 
  with  thin,  smooth  scales,  destitute  of  marginal  spines,  as 
  the  herring  and  salmon.  The  group  is  now  regarded  as