[1] : The Collaborative International Dictionary of English v.0.48

hydra \hy"dra\, n.; pl. e. hydras, l. hydrae. l. hydra,
   gr. "y`dra; akin to "y`dwr water. see otter the animal,
   water.
   1. class. myth. 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.
      1913 webster

            gorgons, and hydras, and chimeras dire. --milton.
      1913 webster

   2. hence: a multifarious evil, or an evil having many
      sources; not to be overcome by a single effort.
      1913 webster

   3. zool. any small fresh-water hydroid of the genus
      hydra, usually found attached to sticks, stones, etc.,
      by a basal sucker.
      1913 webster

   note: the body is a simple tube, having a mouth at one
         extremity, surrounded by a circle of tentacles with
         which it captures its prey. young hydras bud out from
         the sides of the older ones, but soon become detached
         and are then like their parent. hydras are remarkable
         for their power of repairing injuries; for if the body
         be divided in pieces, each piece will grow into a
         complete hydra, to which fact the name alludes. the
         zooids or hydranths of marine hydroids are sometimes
         called hydras.
         1913 webster

   4. astron. a southern constellation of great length lying
      southerly from cancer, leo, and virgo.
      1913 webster
see also:
hydras hydrae otter water hydra 

[2] : WordNet (r) 2.0

hydra
     n 1: greek mythology monster with nine heads; when struck off
          each head was replaced by two new ones; "hydra was slain
          by hercules"
     2: a long faint constellation in the southern hemisphere near
        the equator stretching between virgo and cancer syn: snake
     3: 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: small tubular solitary freshwater hydrozoan polyp
see also:
snake 

[3] : THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993)

hydra, n.  a kind of animal that the ancients catalogued under many
heads.

Hydra >> H Words
Hydra, definition of term: Hydra
hydra_pag1.html

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