The Collaborative International Dictionary of English v.0.48:

alexipyretic \a*lex`i*py*ret"ic\
   ([.a]*l[e^]ks`[i^]*p[-i]*r[e^]t"[i^]k), a. [Gr. 'ale`xein to
   keep off + pyreto`s burning heat, fever, py^r fire.] (Med.)
   Serving to drive off fever; antipyretic; antifebrile.
   [archaic] -- n. An antipyretic drug; a febrifuge. [archaic]
   [1913 Webster + AS] alexiterical