Meaning of hydra

Definition of hydra

(noun) (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones; "Hydra was slain by Hercules"

a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer

trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality; "we may be facing a hydra that defies any easy solution"

small tubular solitary freshwater hydrozoan polyp

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