noun🔗ShareHidrozoosAny of many colonial coelenterates, of the class Hydrozoa, including the hydras, hydroids, hydrocorals, and siphonophores."While snorkeling in the shallow reef, we saw a variety of colorful hydrozoans, including some that looked like tiny trees attached to the rocks. "Mientras buceábamos con esnórquel en el arrecife poco profundo, vimos una variedad de hidrozoos coloridos, incluidos algunos que parecían pequeños árboles adheridos a las rocas.animalorganismbiologyoceanChat with AIVocabulary GamePractice Reading