A minute freshwater coelenterate with a stalklike tubular body and a ring of tentacles around the mouth.
- Genus Hydra, class Hydrozoa
- The Phylum Cnidaria includes such diverse forms as jellyfish, hydra, sea anemones, and corals.
- The same is true for hydra, a freshwater cnidarian.
- There are some animals that don't belong to the Bilateria, though: members of the phylum Cnidaria, the jellyfish, hydra, sea anemones, and corals, which are typically radially symmetric.
1.1 (as noun hydra) A thing that is hard to overcome or resist because of its pervasive or enduring quality or its many aspects.
- Database scalability is a many-headed hydra that's hard to define, let alone tame.
- Yet it appears that multi-headed hydra, our scientific research establishment, is pulling in more than 200 different directions.
- We might have to strike back at some heads on this terrorist hydra, try not to slaughter innocents, and swallow the collateral damage.
Via Latin from Greek hudra.
Words that rhyme with HydraLycra
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