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单词 hydra
释义

WordReference Random House Unabridged Dictionary of American English © 2024
hy•dra  (hīdrə),USA pronunciation n., pl. -dras, -drae  (-drē)USA pronunciation for 1–3,[gen.] -drae  (-drē)USA pronunciation for 4.
  1. Mythology(often cap.) [Class. Myth.]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. Invertebratesany 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.) [Astron.]the Sea Serpent, a large southern constellation extending through 90° of the sky, being the longest of all constellations.
  • Latin); see otter
  • Middle French
  • Greek hýdrā water serpent (replacing Middle English ydre
  • Latin
  • 1325–75

Collins Concise English Dictionary © HarperCollins Publishers::
hydra /ˈhaɪdrə/ n ( pl -dras, -drae / -driː/)
  1. any solitary freshwater hydroid coelenterate of the genus Hydra, in which the body is a slender polyp with tentacles around the mouth
  2. a persistent trouble or evil
Etymology: 16th Century: from Latin, from Greek hudra water serpent; compare otter
Collins Concise English Dictionary © HarperCollins Publishers::
Hydra /ˈhaɪdrə/ n
  1. a monster with nine heads, each of which, when struck off, was replaced by two new ones
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