occurring every other day so that it happens on the first and third days: usually applied to fever or a disease causing it, esp. any of certain forms of malaria
Origin of tertianMiddle English tercian ; from Classical Latin (febris) tertiana, tertian (fever) ; from tertius, third
a tertian fever or disease
Recurring every other day or, when considered inclusively, every third day: a tertian fever.
A tertian fever, such as vivax malaria.
Origin of tertianMiddle English terciane, tertian fever, from Latin (febris) tertiana, (fever) of the third (day), from tertius, third; see trei- in Indo-European roots.
Originally Middle English as part of the collocation fever cum terciane, after Latin febris cum tertiana, from tertius (“third").