Definitions from Wiktionary (AAV)

▸ noun:  (military) Initialism of Assault Amphibious Vehicle.
▸ noun:  (virology) Abbreviation of adeno-associated virus. [(virology) Any of the viruses of the genus Dependoparvovirus that infects primates, but, having no known adverse effects, is a possible vector for therapies.]
▸ noun:  (plumbing) Abbreviation of air admittance vent. [(plumbing) a mechanical sewer vent that allows air to enter into the sewage system but does not allow exhaust of sewer gases, to aid the flow of sewage by providing air behind water, where a standard vent stack to atmosphere is not possible, by drawing in interior air but keeping harmful sewer gases contained.]



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