Portal

An entrance, entry point, or means of entry.

"The local library, a portal of knowledge."

A website or page that acts as an entrance to other websites or pages on the Internet.

"The new medical portal has dozens of topical categories containing links to hundreds of sites."

A short vein that carries blood into the liver.

A magical or technological doorway leading to another location, period in time or dimension.

Of or relating to a porta, especially the porta of the liver.

"the portal vein"