O antigen n.
A somatic antigen of nonmotile bacteria.
1. U.S. Aerospace. Orbiting Astronomical Observatory: one of a series of scientific satellites that studied astronomical phenomena at ultraviolet and x-ray wavelengths. orbiting astronomical observatory
British. 1. old-age pensioner. abbreviation (in Britain) 1. old age pension 2. old age pensioner Outside Awareness Port
1. Office of Alien Property Custodian.
/əʊˈeɪpɛk/ noun acronym 1. Organization of Arab Petroleum Exporting Countries Organization of Arab Petroleum Exporting Countries