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Hydra | [in greek_mythology] monster with nine heads; when struck off each head was replaced by two new ones | ||
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Hydra, Snake | a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer | ||
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hydra | small tubular solitary freshwater hydrozoan polyp | ||
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hydra | trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality |