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

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

adventitial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adventitia (ˌædvɛnˈtɪʃɪə, -ˈtɪʃə)
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]

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American Heritage
Medical Dictionary

adventitia ad·ven·ti·tia (ād'věn-tĭsh'ə, -vən-)
The outermost membranous covering of an organ or structure, especially the outer coat of an artery.

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