the external covering of an organ or other structure, derived from connective tissue, especially the external covering of a blood vessel.
the outermost covering of an organ or part, esp the outer coat of a blood vessel

adventitial ad·ven·ti·tial (ād’věn-tĭsh’əl, -vən-)

Of or relating to the adventitia of an organ or blood vessel.


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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