Hydrozoa
/ˌhaɪdrəʊˈzəʊə/- Zoology a class of coelenterates which includes hydras and Portuguese men-of-war. Many of them are colonial and some kinds have both polypoid and medusoid phases【动】水螅纲。
派生词
hydrozoan
noun & adjective词源
modern Latin (plural), from HYDRO- 'water'+Greek zōion 'animal'.