- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for adventitia
Up to the third decade there is only a strengthening of the media and adventitia.
The adventitia varies much in thickness, being better developed in the medium-sized than in the large arteries.
Coincidently with this, there is thickening by a connective tissue growth in the adventitia.
There is also, as a rule, rather pronounced hypertrophy of the adventitia.
- the outermost covering of an organ or part, esp the outer coat of a blood vessel
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
- 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.