n. 四日热

a. 每第五天发作的

[医] 每第五日[复发]的

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.