ˈvī(ə)lz-, ˈwī(ə)lz- noun
Usage: usually capitalized W
Etymology: after Adolf Weil died 1916 German physician
: a leptospirosis that is characterized by chills, fever, muscle pain, and hepatitis manifested by more or less severe jaundice and that is caused by a spirochete ( Leptospira icterohaemorrhagiae )