CeresPronunciation: /ˈsɪəriːz/Definition of Ceres 1 Roman Mythology the goddess of agriculture. Greek equivalent Demeter. 2 Astronomy the first asteroid to be discovered, found by G. Piazzi of Palermo on 1 January 1801. It is also much the largest (diameter 913 km). Ceres in other Oxford dictionaries Definition of Ceres in the US English dictionary
