Dictionary

adventitia

noun ad·ven·ti·tia \ˌad-vən-ˈti-shə, -(ˌ)ven-\

Definition of ADVENTITIA

:  an external chiefly connective tissue covering of an organ; especially :  the external coat of a blood vessel
ad·ven·ti·tial \-shəl\ adjective
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Origin of ADVENTITIA

New Latin, alteration of Latin adventicia, neuter plural of adventicius coming from outside, from adventus, past participle
First Known Use: 1876
Medical Dictionary

adventitia

noun ad·ven·ti·tia \ˌad-vən-ˈtish-(ē-)ə, -(ˌ)ven-\

Medical Definition of ADVENTITIA

:  the outer layer that makes up a tubular organ or structure and especially a blood vessel, is composed of collagenous and elastic fibers, and is not covered with peritoneum—called also tunica adventitia, tunica externa

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