Bible Dictionaries
Quintan

Webster's Dictionary

(1):

(a.) Occurring as the fifth, after four others also, occurring every fifth day, reckoning inclusively; as, a quintan fever.

(2):

(n.) An intermittent fever which returns every fifth day, reckoning inclusively, or in which the intermission lasts three days.

Bibliography Information
Webster, Noah. Entry for 'Quintan'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​q/quintan.html. 1828.