hydrozoon From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsnounOne of the Hydrozoa. Related wordsSynonymshydractiniidhydrocenidhydrobiidhydrochoeridhydrophiidzooidhyalidhydrophilidanthozoonzoogonidpolyzoanhyperiidmetazoonhyperiideanpolyzoaryrhizocephalan References Wiktionary — hydrozoon Wikipedia — hydrozoon