Of or relating to a point of entrance to an organ, especially the transverse fissure of the liver, through which the blood vessels enter, anatomy Of or relating to a porta, especially the porta of the liver, Of or relating to the portal vein or the portal system, noun_ A doorway, entrance, or gate, especially one that is large and imposing, A door or gate; an entrance or opening for passage; specifically, the entire architectural treatment of the entrance and its surroundings of a great or splendid building, as a cathedral