has part has part has_part characteristic of has modifier double aortic arch defect in which the main aorta tube splits into large left and right branches (right and left aortic arches), encircling the trachea and esophagus, before becoming one tube to go to the lower body double-sided aortic arch Fyler:2761 MPheno.ontology MP:0004159 vascular ring abnormal split arch of aorta