/terr"sheuhn/ , adj.
1. Pathol. (of a malarial fever, etc.) characterized by paroxysms that recur every other day.
n.
2. Pathol. a tertian fever.
3. a Jesuit during the period of tertianship.
[ 1325-75; ME terciane febris ) tertiana tertian (fever), equiv. to terti ( us ) THIRD + -ana, fem. of -anus -AN ]