Definitions of hydra:
  • noun:   small tubular solitary freshwater hydrozoan polyp
  • noun:   trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality
    Example: "We may be facing a hydra that defies any easy solution"
  • noun:   a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
  • noun:   (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones
    Example: "Hydra was slain by Hercules"

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Search for hydra at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

See hydra used in context: 4 Shakespeare works, several books and articles.

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