Tertian
Tertian , adjective
[Latin tertianus, from tertius the third. See Tierce.]
(Medicine) Occurring every third day; as, a tertian fever.
Tertian , noun
[Latin tertiana (sc. febris): compare Old French tertiane.]
1.
(Medicine) 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.