You know what it looks like… but what is it called?
TAKE THE QUIZ“ductus”
We have one entry that includes the term ductus.
ductus arteriosus
noun: 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
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Merriam-Webster unabridged