tertian

ter·tian  (tûrshn)

adj.

Recurring every other day or, when considered inclusively, every third day: a tertian fever.

n. Pathology

A tertian fever, such as vivax malaria.

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[Middle English terciane, tertian fever, from Latin (febris) tertina, (fever) of the third (day), from tertius, third; see trei- in Indo-European roots.]

Thesaurus

Adj.	1.	tertian - relating to symptoms (especially malarial fever) that appear every other day; "tertian fever"
	2.	tertian - of or relating to a tonal system based on major thirds; "a tertian tonal system"