hydrozoa
/ˌhaɪdrəˈzoʊə/
noun
- A class of small, simple animals that live in water, including hydras and some jellyfish. They are related to corals and sea anemones.
- The Portuguese man o' war is a well-known colony of hydrozoa that looks like a single jellyfish.
- Many hydrozoa have a life cycle that includes both a polyp stage and a medusa stage.
- In biology class, we studied how hydrozoa reproduce both sexually and asexually.