The Collaborative International Dictionary
Semitertian
Semitertian \Sem`i*ter"tian\, a. (Med.) Having the characteristics of both a tertian and a quotidian intermittent. -- n. An intermittent combining the characteristics of a tertian and a quotidian.
Wiktionary
semitertian
a. (context obsolete medicine of a fever English) Having a paroxysm every day, and a second stronger one every two days n. (context obsolete medicine English) An intermittent fever of this kind.