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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Antiperiodic  \An`ti*pe`ri*od"ic\,  n.  (Med.) 
  A  remedy  possessing  the  property  of  preventing  the  return  of 
  periodic  paroxysms,  or  exacerbations,  of  disease,  as  in 
  intermittent  fevers.