Dictionaryad•ven•ti•ti•aPronunciation: (ad"ven-tish'ē-u, -tish'u), [key] —n. Anat. the external covering of an organ or other structure, derived from connective tissue, esp. the external covering of a blood vessel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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