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From The Collaborative International Dictionary of English v.0.48:
Quintan \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. [1913 Webster]