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• a  relating to symptoms (especially malarial fever) that appear every other day
  tertian fever
• a  of or relating to a tonal system based on major thirds
  a tertian tonal system

• Influenza, tertian fever, leprosy were all endemic, along with tapeworm and a mysterious intestinal infestation that made its victim long to eat earth.
• On the coastal plains, three out of four cases are of the "benign tertian" variety caused by the parasite Plasmodium vivax, and only one case out of four is "malignant tertian .
• Charles Louis Alphonse Laveran (1845-1922), French military surgeon, discoverer of Plasmodium vivax, germ of tertian malaria.