Definition of portal vein
: a vein that collects blood from one part of the body and distributes it in another through capillaries; especially : a vein carrying blood from the digestive organs and spleen to the liver
Medical Definition of portal vein
: a large vein that is formed by fusion of other veins, that terminates in a capillary network, and that delivers blood to some area of the body other than the heart; especially : hepatic portal vein
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Britannica.com: Encyclopedia article about portal vein
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