OberonPronunciation: /ˈəʊbərɒn/ AstronomyDefinition of Oberon a satellite of Uranus, the furthest from the planet, which has a heavily cratered surface and was discovered by W. Herschel in 1787 (diameter 1,550 km). Origin:from the name of the king of the fairies in Shakespeare's A Midsummer Night's DreamOberon in other Oxford dictionaries Definition of Oberon in the US English dictionary