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  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  acanthocephalan 
  n  :  any  of  various  worms  living  parasitically  in  intestines  of 
  vertebrates  having  a  retractile  proboscis  covered  with 
  many  hooked  spines  [syn:  {spiny-headed  worm}] 

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