quartan

Occurring every fourth day, counting inclusively, or every 72 hours. Used of a fever.

A malarial fever recurring every 72 hours.

Having to do with the fourth; especially, occurring every fourth day: as, a quartan ague or fever (one which recurs on the fourth day—that is, after three days).

An intermitting ague that occurs every fourth day, both days of consecutive occurrence being counted, as on Sunday, Wednesday, Saturday, Tuesday, etc.

A measure containing the fourth part of some other measure.

Of or pertaining to the fourth; occurring every fourth day, reckoning inclusively.

An intermittent fever which returns every fourth day, reckoning inclusively, that is, one in which the interval between paroxysms is two days.

A measure, the fourth part of some other measure.

A fever whose symptoms recur every four days.

Recurring every four days; especially in designating a form of malaria with such symptoms.