adventitia
noun
ad·ven·ti·tia ˌad-vən-ˈti-shə 
-(ˌ)ven-
: an external chiefly connective tissue covering of an organ
especially : the external coat of a blood vessel
adventitial
ˌad-vən-ˈti-shəl
adjective -(ˌ)ven-
Word History
Etymology
borrowed from New Latin, alteration of Latin adventīcia, neuter plural of adventīcius "coming from outside, external" — more at adventitious
First Known Use
1854, in the meaning defined above
Medical Definition
adventitia
noun
ad·ven·ti·tia ˌad-vən-ˈtish-(ē-)ə -(ˌ)ven-
-(ˌ)ven- : 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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