Apyretic :: Apyretic (a.) Without fever; -- applied to days when there is an intermission of fever.
Pyrethrin :: Pyrethrin (n.) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor..
Pyrethrine :: Pyrethrine (n.) An alkaloid extracted from the root of the pellitory of Spain (Anacyclus pyrethrum).
Pyretic :: Pyretic (a.) Of or pertaining to fever; febrile.
Pyretology :: Pyretology (n.) A discourse or treatise on fevers; the doctrine of fevers.