quartan definition by Webster's New World
Origin: Middle English quartaine ; from Middle French (fièvre) quartaine ; from Classical Latin (febris) quartana, (fever) occurring every fourth day, feminine of quartanus ; from quartus, fourth: see quart
quartan definition by American Heritage Dictionary
Origin: Middle English quartaine, from Old French, from Latin quārtāna, from quārtānus, of the fourth, from quārtus, fourth; see kwetwer- in Indo-European roots.
quartan - Medical Definition