Usually means: Multi-headed serpent, regenerates heads.
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We found 40 dictionaries that define the word hydra:

General (27 matching dictionaries)
  1. Hydra: Merriam-Webster
  2. Hydra, Hydra, hydra: Oxford Learner's Dictionaries
  3. Hydra, hydra: American Heritage Dictionary of the English Language
  4. hydra: Collins English Dictionary
  5. Hydra, hydra: Vocabulary.com
  6. Hydra, hydra: Wordnik
  7. hydra: Cambridge Advanced Learner's Dictionary
  8. hydra: Wiktionary
  9. Hydra: Webster's New World College Dictionary, 4th Ed.
  10. hydra: The Wordsmyth English Dictionary-Thesaurus
  11. hydra: Infoplease Dictionary
  12. hydra: Dictionary.com
  13. hydra: Online Etymology Dictionary
  14. H.Y.D.R.A, HYDRA (comics), HYDRA, Hydra (Dungeons & Dragons), Hydra (Marvel Comics), Hydra (Otep album), Hydra (Toto album), Hydra (Within Temptation album), Hydra (album), Hydra (association), Hydra (band), Hydra (boat), Hydra (chess), Hydra (comics), Hydra (constellation), Hydra (disambiguation), Hydra (film), Hydra (genus), Hydra (island), Hydra (moon), Hydra (mythology), Hydra (operating system), Hydra (ship), Hydra (skater), Hydra (software), Hydra (video game), Hydra, The Hydra: Wikipedia, the Free Encyclopedia
  15. Hydra: Online Plain Text English Dictionary
  16. hydra: Webster's Revised Unabridged, 1913 Edition
  17. hydra: Rhymezone
  18. Hydra: AllWords.com Multi-Lingual Dictionary
  19. hydra: Webster's 1828 Dictionary
  20. hydra: FreeDictionary.org
  21. hydra: Mnemonic Dictionary
  22. Hydra: TheFreeDictionary.com
  23. Hydra: Dictionary of Phrase and Fable (1898)
  24. hydra: Longman Dictionary of Contemporary English
  25. Hydra: Merriam-Webster

Art (4 matching dictionaries)
  1. hydra: Global Glossary
  2. An Etymological Dictionary of Classical Mythology (No longer online)
  3. hydra-: A Cross Reference of Latin and Greek Elements
  4. Natural Magick (No longer online)

Computing (1 matching dictionary)
  1. Hydra (comics), Hydra (disambiguation), hydra: Encyclopedia

Medicine (3 matching dictionaries)
  1. hydra: Merriam-Webster Medical Dictionary
  2. Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)

Miscellaneous (3 matching dictionaries)
  1. HYDRA: Acronym Finder
  2. hydra: A Word A Day
  3. AbbreviationZ (No longer online)

Science (1 matching dictionary)
  1. Fishkeeping glossary (No longer online)

Slang (1 matching dictionary)
  1. hydra: Urban Dictionary

(Note: See hydrae as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (fantasy) A dragon-like creature with many heads and the ability to regrow them when maimed.
noun:  (biology) 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.
noun:  (figurative) A complex, multifarious problem or situation that cannot be solved easily and rapidly.
noun:  (Greek mythology) A mythological serpent with many heads, slain by Hercules as one of his twelve labours.
noun:  (astronomy) A spring constellation of the northern sky, said to resemble a serpent. It lies just south of the zodiac and contains the star Alphard.
noun:  (astronomy) One of Pluto's moons.
noun:  One of the Saronic Islands in the Aegean Sea.
noun:  (geography) A commune in Algiers Province, Algeria.

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