adventitia: Meaning and Definition of
ad•ven•ti•ti•a
Pronunciation: (ad"ven-tish'ē-u, -tish'u), [key]
— n. Anat.
- the external covering of an organ or other structure, derived from connective tissue, esp. the external covering of a blood vessel.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.