adventitia

from WordNet (r) 3.0 (2006)
adventitia
    n 1: an enveloping or covering membrane or layer of body tissue
         [syn: {tunic}, {tunica}, {adventitia}]
from The Collaborative International Dictionary of English v.0.48
adventitia \adventitia\ n.
   1. the membranous outer covering of an organ or blood vessel.
      [WordNet 1.5]
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