Main Entry: duc·tus ar·te·ri·o·sus

Pronunciation: \ˈdək-təs-är-ˌtir-ē-ˈō-səs\

Function: noun

Etymology: New Latin, literally, arterial duct

Date: 1811

: a short broad vessel in the fetus that connects the pulmonary artery with the aorta and conducts most of the blood directly from the right ventricle to the aorta bypassing the lungs