Is “Quartan” a Scrabble word?
Yes
QUARTAN
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Quartan
/ˈkwɔːtən/
noun
1.A fever whose symptoms recur every four days.
adjective
1.Recurring every four days; especially in designating a form of malaria with such symptoms.