quartan

adj. (about attacks of disease) recurring every fourth day

Adjective
1. occurring every fourth day (especially the fever and weakness of malaria); "quartan malaria"
(pertainym) time period, period of time, period

adj. quartan, (about attacks of disease) recurring every fourth day

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

(n.)
A measure, the fourth part of some other measure.
  

(a.)
Of or pertaining to the fourth; occurring every fourth day, reckoning inclusively; as, a quartan ague, or fever.
  

Something which occurs every four days