Source : WordNet®

tetralogy of Fallot
     n : a congenital heart defect producing cyanosis; characterized
         by four symptoms: pulmonary stenosis and ventricular
         septal defect and malposition of the aorta over both
         ventricles and hypertrophy of the right ventricle [syn: {Fallot's
         tetralogy}, {Fallot's syndrome}]