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Definition of hydra noun from the Oxford Advanced Learner's Dictionary

hydra

noun
 
/ˈhaɪdrə/
 
/ˈhaɪdrə/
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  1. Hydra
    (in ancient Greek stories) a snake with several heads. As one head was cut off, another one grew. In the end it was killed by Hercules.
  2. (formal) a thing that is very difficult to deal with, because it continues for a long time or because it has many different aspects
  3. (biology) an extremely small water creature with a body that is like a tube in shape and tentacles around its mouth
  4. Word Originvia Latin from Greek hudra ‘water snake’, named by Linnaeus because, if cut into pieces, each section can grow into a whole animal.
See hydra in the Oxford Advanced American Dictionary
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