Ter"tian (?), a. [L. tertianus, from tertius the third. See Tierce.] Med.
Occurring every third day; as, a tertian fever.
© Webster 1913.
Ter"tian, n. [L. tertiana (sc. febris): cf. OF. tertiane.]
1. Med.
A disease, especially an intermittent fever, which returns every third day, reckoning inclusively, or in which the intermission lasts one day.
2.
A liquid measure formerly used for wine, equal to seventy imperial, or eighty-four wine, gallons, being one third of a tun.
© Webster 1913.