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"reducing fever; that which reduces fever," 1680s, from anti- + Greek pyretos "fever, burning heat," related to pyr "fire" (see fire (n.)) + -ic.
antipyretic an·ti·py·ret·ic (ān'tē-pī-rět'ĭk, ān'tī-)n. An agent that reduces or prevents fever. Also called antifebrile, antithermic. adj. Reducing or preventing fever.