Definition of Hydrozoa in English:


Line breaks: Hydro|zoa
Pronunciation: /ˌhʌɪdrə(ʊ)ˈzəʊə


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.
More example sentences
  • The groups Hydrozoa, Scyphozoa and Cubozoa all are generally characterized as having polyps and medusae (although minor lineages have lost medusae and in some cases polyps).
  • Another feature that is quite common in Hydrozoa but not typical of Scyphozoa is colonial organization.
  • However, Hydra is not typical of the Hydrozoa as a whole.


modern Latin (plural), from hydro- 'water' + Greek zōion 'animal'.

Definition of Hydrozoa in: