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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Cestoidea  \Ces*toid"e*a\  (s[e^]s*toid"[-e]*[.a]),  n.  pl  [NL., 
  gr  Gr  kesto`s  girdle  +  -oid.]  (Zo["o]l.) 
  A  class  of  parasitic  worms  (Platelminthes)  of  which  the 
  tapeworms  are  the  most  common  examples.  The  body  is 
  flattened,  and  usually  but  not  always  long,  and  composed  of 
  numerous  joints  or  segments,  each  of  which  may  contain  a 
  complete  set  of  male  and  female  reproductive  organs.  They 
  have  neither  mouth  nor  intestine.  See  {Tapeworm}.  [Written 
  also  {Cestoda}.]