noun🔗ShareHydroidenAny of many colonial coelenterates that exist mainly as a polyp; a hydrozoan"The marine biologist pointed out the delicate, branching structures of the hydroids attached to the pier, explaining that they were colonies of tiny, individual animals. "Der Meeresbiologe wies auf die zarten, verzweigten Strukturen der Hydroiden hin, die an der Pier befestigt waren, und erklärte, dass es sich um Kolonien winziger, einzelner Tiere handelte.organismanimalbiologyoceanChat with AIVocabulary GamePractice Reading