The Collaborative International Dictionary
Febrifacient
Febrifacient \Feb`ri*fa"cient\, a. [L. febris fever + faciens,
p. pr. of facere to make.]
Febrific.
--Dunglison. -- n. That which causes fever.
--Beddoes.
Wiktionary
febrifacient
a. (context rare archaic English) Producing a fever. n. A substance that produces a fever.