Hydra

  1. Proper noun.  (Greek mythology) A mythological serpent with seven heads, slain by Hercules as one of his twelve labours. Also called the Lernaean Hydra.
  2. Proper noun.  (constellation) A spring constellation of the northern sky, said to resemble a serpent. It lies just south of the zodiac and contains the star Alphard.
  3. Proper noun.  (astronomy) The name of one of Pluto's moons. (Named 21 June 2006).
  4. Noun.  Any of several small freshwater polyps of the genus ''Hydra'' and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.
  5. Noun.  A complex, multifarious problem or situation that cannot be solved easily and rapidly.

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This entry was last updated on RefTopia from its source on 3/20/2012.