D defs.my
Entry 1 sense Webster, 1913

Antiperiodic

/(ăn`tĭ*pē`rĭ*ŏd"ĭk)/ · An·ti·pe·ri·od·ic · IPA
01 n. A remedy possessing the property of preventing the return of periodic paroxysms, or exacerbations, of disease, as in intermittent fevers.
  1. 1.
    A remedy possessing the property of preventing the return of periodic paroxysms, or exacerbations, of disease, as in intermittent fevers.(Med.)