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Meaning of portal system

por'tal sys"tem

Pronunciation: [key]
— Anat. Anat.
  1. a vascular arrangement in which blood from the capillaries of one organ is transported to the capillaries of another organ by a connecting vein or veins.
  2. (loosely) the hepatoportal system.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.