Definition of adventitia in English:

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Pronunciation: /ˌadvenˈtiSH(ē)ə/


The outermost layer of the wall of a blood vessel.
Example sentences
  • The outer layer of veins comprises the tunica adventitia.
  • The arteries were most susceptible, with bruising of the intima and adventitia and separation of the media from the vessel walls.
  • There is an intense inflammatory reaction concentrated primarily in the adventitia of this blood vessel with some extension into the tunica media.



Example sentences
  • Aneurysmal development is caused by weakness in the muscular tunica media and stretching of the tunica intima and adventitial layers.
  • The inclusions may also be found in the adventitial cells of blood vessels.
  • Intimai proliferation and adventitial thickening may further reduce the cross-sectional area of the pulmonary vascular bed.


Late 19th century: from modern Latin (tunica) adventitia 'additional (sheath)'.

For editors and proofreaders

Syllabification: ad·ven·ti·tia

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