portal

(pôrˈtl, pōrˈ-)

1. A doorway, entrance, or gate, especially one that is large and imposing.
2. An entrance or a means of entrance: the local library, a portal of knowledge.
3. The portal vein.
4. A website considered as an entry point to other websites, often by being or providing access to a search engine.

1. Of or relating to the portal vein or the portal system.
2. Of or relating to a point of entrance to an organ, especially the transverse fissure of the liver, through which the blood vessels enter.