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  1. portal system

    • n.
      the system of blood vessels consisting of the hepatic portal vein with its tributaries and branches.;any system of blood vessels which has a capillary network at each end.
    • noun: portal system, plural noun: portal systems

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    • IPA[ˈpôrdl ˈsistim]
    • n.
      the system of blood vessels consisting of the portal vein with its tributaries and branches.

    Oxford American Dictionary