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WordReference Random House Unabridged Dictionary of American English © 2024hy•dra (hī′drə),USA pronunciation n., pl. -dras, -drae (-drē)USA pronunciation for 1–3,[gen.] -drae (-drē)USA pronunciation for 4.- 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. - 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.
- a persistent or many-sided problem that presents new obstacles as soon as one aspect is solved.
- (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/)- any solitary freshwater hydroid coelenterate of the genus Hydra, in which the body is a slender polyp with tentacles around the mouth
- 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 - a monster with nine heads, each of which, when struck off, was replaced by two new ones
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