Origin and Etymology of adventitia
New Latin, alteration of Latin adventicia, neuter plural of adventicius coming from outside, from adventus, past participle
First Known Use: 1876
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
Seen and Heard
What made you want to look up adventitia? Please tell us where you read or heard it (including the quote, if possible).