noun🔗ShareHidrozooAny of many colonial coelenterates, of the class Hydrozoa, including the hydras, hydroids, hydrocorals, and siphonophores."While swimming, the marine biologist pointed out a colorful, branching hydrozoan attached to a rock, explaining that it was a colony of many tiny, individual animals working together. "Mientras nadaba, el biólogo marino señaló un hidrozoo colorido y ramificado adherido a una roca, explicando que era una colonia de muchos animales diminutos e individuales que trabajaban juntos.organismanimalbiologyoceannatureChat with AIVocabulary GamePractice Reading