Collins Concise English Dictionary © HarperCollins Publishers::

tertian /ˈtɜːʃən/ adj
  1. (of a fever or the symptoms of a disease, esp malaria) occurring every other day
  1. a tertian fever or symptoms
Etymology: 14th Century: from Latin febris tertiāna fever occurring every third day, reckoned inclusively, from tertius third

'tertian' also found in these entries:
In the English description:

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