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Hydrozoa Syllabification: Hy·dro·zo·a
Pronunciation: /ˌhīdrəˈzōə/

Definition of Hydrozoa in English:

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.
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:
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