madreporeEnglishOxford New American Dictionarymadrepore /ˈmadrəˌpôr, ˈmædrəˌpɔr / ▸ noun 1 a stony coral of the genus Madrepora. 2 the polyp producing the stony coral of the genus Madrepora. – DERIVATIVES madreporic /ˌmadrəˈpôrik/ adjective