Dictionary entry

Quintan

Webster's Dictionary 1913

Quin″tan (?), a. [L. quintanus, fr. quintus fifth, quinque five. See Five.] Occurring as the fifth, after four others also, occurring every fifth day, reckoning inclusively; as, a quintan fever. — n.(Med.) An intermittent fever which returns every fifth day, reckoning inclusively, or in which the intermission lasts three days.