Definition of hydra Hydra
/hajˈdɹʌ/ - [haydru] - hy•dra
We found 14 definitions of hydra from 6 different sources.
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What does hydra mean?
WordNet
NounPlural: hydras |
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| hydra - small tubular solitary freshwater hydrozoan polyp | ||
| hydroid, hydrozoan colonial coelenterates having the polyp phase dominant | ||
| hydra - (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones; "Hydra was slain by Hercules" | ||
| mythical creature, mythical monster a monster renowned in folklore and myth | ||
| 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" | ||
| hydra - a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer | ||
| Snake | ||
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Wiktionary 
- hydra (Noun)
Any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles. - hydra (Noun)
A complex, multifarious problem or situation that cannot be solved easily and rapidly.
Webster DictionaryWebster's Unabridged Dictionary 📘
- hydra (n.)
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. - hydra (n.)
Hence: A multifarious evil, or an evil having many sources; not to be overcome by a single effort. - hydra (n.)
Any small fresh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker. - hydra (n.)
A southern constellation of great length lying southerly from Cancer, Leo, and Virgo.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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hydra
hī′dra, n. (myth.) a water-serpent with many heads, which when cut off were succeeded by others: any manifold evil: a genus of fresh-water polyps remarkable for their power of multiplication by being cut or divided.—adjs. Hy′dra-head′ed, difficulty to root out, springing up vigorously again and again; Hy′droid, like the hydra. [L.,—Gr. hydra—hydōr, water, akin to Sans. udras, an otter.]
Wikipedia 
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animal
Hydras are simple invertebrates. They live in the water. Their body is radially symmetric. They have a central cavity that serves to both take in food and expel waste. Being Cnidarians they have stinging cells on their tentacles. They are hydrozoa, and belong to the same order as the polyps. Most hydras are microscopic in size. Hydras can be found in almost any unpolluted body of water. -
moon
Hydra is the farthest moon of Pluto. It was found along with Nix in June, 2005 by the Hubble Space Telescope's Pluto Companion Search Team, which is composed of Hal A. Weaver, Alan Stern, Max J. Mutchler, Andrew J. Steffl, Marc W. Buie, William J. Merline, John R. Spencer, Eliot F. Young, and Leslie A. Young. The discovery images were taken on May 15, 2005 and May 18, 2005; the moons were independently found by Max J. Mutchler on June 15, 2005 and Andrew J. Steffl on August 15, 2005. The discoveries were announced on October 31, 2005, after confirmation by precoveries from 2002. The moons were provisionally designated S/2005 P 1 (Hydra) and S/2005 P 2 (Nix).
The moon orbits the barycenter of the system in the same plane as Charon and Nix, at a distance of about 65,000 km. Unlike other moons of Pluto, its orbit is only nearly circular; its eccentricity of 0.0052 is small, but significantly non-zero. Its orbital period of 38.2 days.
Although its size has not been directly measured, calculations based on its brightness give it a diameter of between 61 km, if its reflectivity is similar to Charon's 35 percent, and about 167 km, if it has a reflectivity of 4 percent like the darkest Kuiper belt objects (KBOs). At the time of discovery, Hydra was about 25 percent brighter than its sister moon Nix, which led to the assumption that its diameter was some 10 percent bigger. Pre-discovery data from Hubble observations in 2002-3 inferred that Nix was the brighter moon. However, Hubble ob
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