hydra

Noun
  1. (Greek mythology) monster with nine heads;
    When struck off each head was replaced by two new ones (synset 109519392)
    "Hydra was slain by Hercules"
    referred to in: greek mythology - the mythology of the ancient Greeks
    is a type of: mythical creature, mythical monster - a monster renowned in folklore and myth
  2. A long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer (synset 109330458)
    is an instance of: constellation - a configuration of stars as seen from the earth
    same as: snake
  3. Trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality (synset 105695974)
    "we may be facing a hydra that defies any easy solution"
    is a type of: problem, trouble - a source of difficulty
  4. Small tubular solitary freshwater hydrozoan polyp (synset 101914793)
    is a type of: hydroid, hydrozoan - colonial coelenterates having the polyp phase dominant
    belongs to: genus hydra - hydras

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