remittent
adjective
re·mit·tent ri-ˈmi-tᵊnt 
of a disease
: marked by alternating periods of abatement and increase of symptoms
remittent fever
Word History
Etymology
borrowed from Latin remittent-, remittens, present participle of remittere "to send back, release, relax, abate" — more at remit entry 1
First Known Use
1693, in the meaning defined above
Medical Definition
remittent
adjective
re·mit·tent ri-ˈmit-ᵊnt
: marked by alternating periods of abatement and increase of symptoms
remittent fever