Meaning of hydra

hy•dra

Pronunciation: (hī'dru), [key]
— pl. gen. -dras, -drae -drae
  1. (often cap.)a water or marsh serpent with nine heads, each of which, if cut off, grew back as two; Hercules killed this serpent by cauterizing the necks as he cut off the heads.
  2. any freshwater polyp of the genus Hydra and related genera, having a cylindrical body with a ring of tentacles surrounding the mouth, and usually living attached to rocks, plants, etc., but also capable of detaching and floating in the water.
  3. a persistent or many-sided problem that presents new obstacles as soon as one aspect is solved.
  4. (cap.)the Sea Serpent, a large southern constellation extending through 90° of the sky, being the longest of all constellations.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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