Definify.com
Webster 1913 Edition
Semitertian
Semˊi-ter′tian
,Adj.
 (Med.) 
Having the characteristics of both a tertian and a quotidian intermittent. 
– Noun.
 An intermittent combining the characteristics of a tertian and a quotidian.
 Webster 1828 Edition
Semitertian
SEMITER'TIAN
,Adj.
  SEMITER'TIAN
,Noun.
  Definition 2025
semitertian
semitertian
English
Adjective
semitertian (not comparable)
- (obsolete, medicine, of a fever) Having a paroxysm every day, and a second stronger one every two days
 
Noun
semitertian (plural semitertians)
- (obsolete, medicine) An intermittent fever of this kind.