Tertian1. (a.) Occurring every third day; as, a tertian fever.
2. (n.) A disease, especially an intermittent fever, which returns every third day, reckoning inclusively, or in which the intermission lasts one day.
3. (n.) A liquid measure formerly used for wine, equal to seventy imperial, or eighty-four wine, gallons, being one third of a tun.
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