HYDRA (noun)

1 : a many-headed serpent or monster in Greek mythology that was slain by Hercules and each head of which when cut off was replaced by two others

2 not capitalized : a multifarious evil not to be overcome by a single effort

3 [ Latin (genitive. Hydrae), from Greek ] : a southern constellation of great length that lies south of Cancer, Sextans, Corvus, and Virgo and is represented on old maps by a serpent

4 not capitalized [ New Latin, from Latin, Hydra ] : any of numerous small tubular freshwater hydrozoan polyps (Hydra and related genera) having at one end a mouth surrounded by tentacles

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