[ ad-ven-tish-ee-uh, -tish-uh ]
/ ˌæd vɛnˈtɪʃ i ə, -ˈtɪʃ ə /

noun Anatomy.

the external covering of an organ or other structure, derived from connective tissue, especially the external covering of a blood vessel.

Origin of adventitia

1875–80; < Latin adventīcia, neuter plural of adventīcius adventitious

Related forms

ad·ven·ti·tial, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for adventitial


/ (ˌædvɛnˈtɪʃɪə, -ˈtɪʃə) /


the outermost covering of an organ or part, esp the outer coat of a blood vessel

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

Medicine definitions for adventitial (1 of 2)


[ ăd′vĕn-tĭshəl ]


Of or relating to the adventitia of an organ or blood vessel.

Medicine definitions for adventitial (2 of 2)


[ ăd′vĕn-tĭshə ]


The outermost membranous covering of an organ or structure, especially the outer coat of an artery.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.