noun🔗ShareHidroidesAny 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. "El biólogo marino señaló las delicadas estructuras ramificadas de los hidroides adheridos al muelle, explicando que eran colonias de pequeños animales individuales.organismanimalbiologyoceanChat with AIVocabulary GamePractice Reading