porta

from The Century Dictionary.

• noun In anatomy: The entrance or great transverse fissure of the liver: especially in the term vena portæ, the portal vein (which see, under portal). See cut under liver.
• noun The foramen of Monro; especially, the lateral orifice of the Y-shaped foramen which opens communication between each of the lateral ventricles of the brain and the third ventricle.

from the GNU version of the Collaborative International Dictionary of English.

• noun The part of the liver or other organ where its vessels and nerves enter; the hilus.
• noun The foramen of Monro.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun anatomy The part of the liver or other organ where its vessels and nerves enter; the hilum.
• noun anatomy The foramen of Monro.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an aperture or hole that opens into a bodily cavity