quartan

quar·tan  (kwôrtn)

adj.

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

n.

A malarial fever recurring every 72 hours.

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[Middle English quartaine, from Old French, from Latin qurtna, from qurtnus, of the fourth, from qurtus, fourth; see k^wetwer- in Indo-European roots.]

Thesaurus

Noun	1.	quartan - a malarial fever that recurs every fourth day chills and fever, ague - successive stages of chills and fever that is a symptom of malaria
Adj.	1.	quartan - occurring every fourth day (especially the fever and weakness of malaria); "quartan malaria"