Definitions from Wiktionary (OPV)

▸ noun:  (military, aviation, US) Initialism of optionally piloted vehicle. [(US, military, aviation) An aircraft that may be manned or unmanned, able to function in either mode without modification.]
▸ noun:  (electrochemistry) Initialism of organic photovoltaic.
▸ noun:  (medicine) Initialism of oral poliovirus vaccine.
▸ Also see opv


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