Hydrozoa Syllabification: (Hy·dro·zo·a)Pronunciation: /ˌhīdrəˈzōə/ ZoologyDefinition of Hydrozoa a class of coelenterates that includes hydras and Portuguese men-of-war. Many of them are colonial, and some kinds have both polypoid and medusoid phases. Origin:modern Latin (plural), from hydro- 'water' + Greek zōion 'animal'Hydrozoa in other Oxford dictionaries Definition of Hydrozoa in the British & World English dictionary
