Definition of "adventitia" [adventitia]

• The membranous outer covering of an organ or a blood vessel. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Figure 5.2 Moving Through The artery has three layers—the inner to help blood move through the artery (intima), the outer (adventitia) to protect it from the outside, plus a middle, muscular layer (media)."
• "Outer layer: The outer layer the adventitia shields the artery from the rest of your body like sausage casing; it holds the artery together from the outside."
• "The histological examination showed a large increase of the connective tissue of the adventitia and of the connective tissue of the intima, but the muscular fibres were normal."