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1. (n.) hydra
(often cap.) a water monster of Greek myth having nine heads, each of which, if cut off, grew back as two.
2. hydra
any freshwater polyp of the family Hydridae, having a cylindrical body with a ring of tentacles surrounding the mouth.
3. hydra
a persistent or complex problem that presents new obstacles even as existing ones are overcome.
4. hydra
(cap.) the Sea Serpent, a southern constellation extending through 90° of the sky.
Etymology: (1325–75; ME ydre < MF < L < Gk hýdrā water serpent; cf. otter)
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| Definition of 'HYDRA' |
Princeton's WordNet |
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1. (noun) Hydra
(Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones
"Hydra was slain by Hercules"
2. (noun) Hydra, Snake
a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
3. (noun) hydra
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"
4. (noun) hydra
small tubular solitary freshwater hydrozoan polyp
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| Definition of 'HYDRA' |
Webster Dictionary |
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1. (noun) HYDRA
a serpent or monster in the lake or marsh of Lerna, in the Peloponnesus, represented as having many heads, one of which, when cut off, was immediately succeeded by two others, unless the wound was cauterized. It was slain by Hercules. Hence, a terrible monster
2. (noun) HYDRA
hence: A multifarious evil, or an evil having many sources; not to be overcome by a single effort
3. (noun) HYDRA
any small fresh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker
4. (noun) HYDRA
a southern constellation of great length lying southerly from Cancer, Leo, and Virgo
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| Definition of 'HYDRA' |
U.S. National Library of Medicine |
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1. HYDRA
A genus of freshwater polyps in the family Hydridae, order Hydroida, class HYDROZOA. They are of special interest because of their complex organization and because their adult organization corresponds roughly to the gastrula of higher animals.
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Definitions of HYDRA 
