English Pronunciation Rhymes: -ɒɹəl Noun hydrocoral (plural hydrocorals) Any hydrozoan, of the order Anthoathecata, that has a calcareous skeleton and so resembles a coral Translations hydrozoan of the order Anthoathecata with calcareous skeleton Japanese: ヒドロサンゴ (hidorosango) Wikiwand - on Seamless Wikipedia browsing. On steroids.