adj.
Pronunciation: ' kwo ̇ r-t ə n
Function: adjective
Etymology: Middle English quarteyn, from Anglo-French ( fevre ) quartaine quartan fever, from Latin ( febris ) quartana, from quartanus of the fourth, from quartus
Date: 14th century
: occurring every fourth day reckoning inclusively specifically : recurring at approximately 72-hour intervals <a quartan ague>