quartan adjective & noun. ['kwɔ:t(ǝ)n] ME.
[Old & mod. French quartaine (sc. fièvre fever) from Latin quartana (sc. febris) fem. of quartanus, from quartus: see QUART noun¹, -AN.]
Medicine.
A. adjective. Designating a fever recurring every third (by inclusive reckoning every fourth) day. ME.
quartan malaria, (arch.) quartan ague a relatively mild form of malaria due to infection by Plasmodium malariae.
b. noun. A quartan fever. LME.

[TahlilGaran] English Dictionary ▲