Hydra

Hydra may stand for:

a simple fresh-water animal of the class Hydrozoa. See Hydra (biology).
a constellation. See Hydra (constellation). Sometimes Hydra is confused with the constellation Hydrus.
in Greek mythology, a many-headed serpent which Heracles defeated. See Lernaean Hydra.
one of the Saronic Islands in Greece. See Hydra, Saronic Islands.
the name of a distributed operating system developed at Carnegie Mellon University.
in the Marvel Universe, HYDRA is a secret criminal organization (originally affiliated with the Nazis) fighting for world domination.

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