ScleractiniaPronunciation: /ˌsklɛrakˈtɪnɪə/Definition of Scleractinia noun Zoology an order of coelenterates that comprises the stony corals. Also called Madreporaria.Derivatives scleractinian noun & adjective Origin:modern Latin (plural), from Greek sklēros 'hard' + aktis, aktin- 'ray'Scleractinia in other Oxford dictionaries Definition of Scleractinia in the US English dictionary
