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HydraIn astronomy, Hydra (the sea monster) is a constellation. See Hydra (constellation). Sometimes Hydra is confused with the constellation Hydrus.
In Greek mythology, the Hydra is the many-headed serpent which Heracles defeated. See Lernaean Hydra
Hydra is one of the Saronic Islands in Greece.
Hydra is also the name of a distributed operating system developed at Carnegie Mellon University.
In zoology, Hydra is the name of a genus of simple fresh-water polyp, of the class Hydrozoa. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hydra".