Febris

The English word foment¹ means “to cause something bad to develop”. It ultimatley comes from the Latin foveō, which means “I warm” or “I nurture”. Unfortunately, I didn’t find any other common words having this origin, but its Latin cognate febris (via the PIE *dʰegʷʰ-), meaning “fever”, has some descendants.

The following words are derived from febris: fever, febrile², and febrifuge³ (which are all related to the sense “fever”). Febrile means “pertaining to fever”. This word is pretty similar to feverish in terms of its definitions, because both also have the figurative sense “showing great excitement”, but febrile is not often used in this sense compared to feverish.

The word febrifuge is the combination of febris and -fuge, the latter of which comes from the Latin fugō meaning “I drive away”⁴. Therefore, it means “a medicine adapted to drive away fever”.