Definitions from Wiktionary (Hydra)

▸ 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.
▸ Also see hydra



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