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  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  antihistamine 
  n  :  a  medicine  used  to  treat  allergies  and  hypersensitive 
  reactions  and  colds;  works  by  counteracting  the  effects 
  of  histamine  on  the  receptor  site  known  as  H1 

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