/ Dictionary / Index P portal vein: Meaning and Definition of Find definitions for: por'tal vein' Pronunciation: [key] — Anat. Anat. the large vein conveying blood to the liver from the veins of the stomach, intestine, spleen, and pancreas. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. portal-to-portal pay portamento Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language