ter·tian (tûr'shən) adj. Recurring every other day or, when considered inclusively, every third day: a tertian fever. n.
Pathology A tertian fever, such as vivax malaria.
[Middle English terciane, tertian fever, from Latin (febris) tertiāna, (fever) of the third (day), from tertius, third; see trei- in Indo-European roots.]
Main Entry: 1ter·tian Pronunciation: 't&r-sh&n Function: adjective : recurring at approximately 48-hour intervals —usedchiefly of vivax malaria; —compare QUARTAN
Main Entry: 2tertian Function: noun : a tertian fever; specifically:VIVAXMALARIA