SINCE 1828
omphalomesenteric vein
nounMedical Definition of omphalomesenteric vein
: any of the veins in a vertebrate embryo that return the blood from the yolk sac to the heart or later to the portal vein and in mammals have their function of bringing nutriment to the embryo superseded early by that of the umbilical vein
— called also vitelline vein
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