Origin: ME quartaine < MFr (fièvre) quartaine < L (febris) quartana, (fever) occurring every fourth day, fem. of quartanus < quartus, fourth: see quart
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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