noun🔗ShareAny 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. "organismanimalbiologyoceannatureChat with AIVocabulary GamePractice Reading
