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adventitia

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

Definition of adventitia

  1. :  an external chiefly connective tissue covering of an organ; especially :  the external coat of a blood vessel

ad·ven·ti·tialplay \-shəl\ adjective


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

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

Medical Definition of adventitia

  1. :  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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