• synonyms


[ad-ven-tish-ee-uh, -tish-uh]
noun Anatomy.
  1. the external covering of an organ or other structure, derived from connective tissue, especially the external covering of a blood vessel.
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Origin of adventitia

1875–80; < Latin adventīcia, neuter plural of adventīcius adventitious
Related formsad·ven·ti·tial, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for adventitial


  1. the outermost covering of an organ or part, esp the outer coat of a blood vessel
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Word Origin for adventitia

C19: New Latin, from the neuter plural of Latin adventīcius; see adventitious
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adventitial in Medicine


  1. Of or relating to the adventitia of an organ or blood vessel.
  2. Adventitious.
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  1. The outermost membranous covering of an organ or structure, especially the outer coat of an artery.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.