
[Middle English quartaine, from Old French, from Latin quārtāna, from quārtānus, of the fourth, from quārtus, fourth.]
Recurring every fourth day, counting inclusively, or every 72 hours. Used of a fever.
n.A quartan malarial fever.
1. recurring in 4-day cycles (every third day).
2. a variety of intermittent fever of which the paroxysms recur on every third day.