Wordnet 3.0
NOUN (1)
1. 
 any medicine that lowers body temperature to prevent or alleviate fever; 
[syn: antipyretic, febrifuge]
ADJECTIVE (1)
1.  preventing or alleviating fever; 
The Collaborative International Dictionary of English v.0.48:
Antipyretic \An`ti*py*ret"ic\, a. (Med.)
   Efficacious in preventing or allaying fever. -- n. A
   febrifuge.
   [1913 Webster]
WordNet (r) 3.0 (2006):
antipyretic
    adj 1: preventing or alleviating fever [ant: pyretic]
    n 1: any medicine that lowers body temperature to prevent or
         alleviate fever [syn: antipyretic, febrifuge]