Hydra may refer to:

• Lernaean Hydra, a mythological many-headed serpent
• hydra-, an alternate spelling of the suffix hydro-, referring to water. In Greek mythology, the Lernaean Hydra ( Greek: ( was an ancient nameless serpent -like Chthonic water beast that possessed numerous

It may also refer to:

Contents 1 In science 2 In technology 3 In society 4 In music 5 In fiction 6 Other

In science

• Hydra (constellation), the largest of the modern star constellations. Hydra (ˈhaɪdrə is the largest of the 88 modern Constellations and was also one of the 48 constellations listed by Ptolemy.
• Hydra (moon), the third moon of the dwarf planet Pluto. Hydra (ˈhaɪdrə, or as in Greek Ύδρα is the outer-most Natural satellite of Pluto.
• Hydra (genus), a genus of simple fresh-water animals of the class Hydrozoa. Hydra is a Genus of simple fresh-water animals possessing radial symmetry.
• Hydra-Centaurus Supercluster, a supercluster of galaxies. The Hydra-Centaurus Supercluster, or the Hydra and Centaurus superclusters, is a Supercluster in two parts and the closest Neighbour of

In technology

• Hydra (chess), a chess computer. Hydra is a chess machine designed by a team with Dr Christian "Chrilly" Donninger, Dr
• Hydra (operating system). HYDRA was an early capability-based, object-oriented, Microkernel designed to support a wide range of possible Operating systems to run on top
• Hydra (software), a software used to test weak computer network passwords. Hydra was a software project developed by "The Hacker's Choice" (THC that uses a Dictionary attack to test for weak or simple passwords on one or many
• HYDRA Game Development Kit, a retro games development system, by André LaMothe. The HYDRA Game Development Kit is the latest (launched in September 2006) creation of Andre LaMothe similar to the XGameStation.
• HMS Hydra, the name of several Royal Navy vessels. Seven ships of the Royal Navy have borne the name HMS Hydra, after the Lernaean Hydra of Greek mythology: was a 24-gun
• Hydra, a hydrogen ship. The Hydra is a 22 person Hydrogen ship, power-assisted by an Electric motor that gets its Electricity from a Fuel cell.
• Hydra 70, an air-to-ground rocket. The Hydra 70 rocket is a weapon derived from the 275 inch (70 mm "Folding-Fin Aerial Rocket" ( Mk 4/Mk 40 Folding-Fin Aerial Rocket) developed by the U
• Hydra Project (EU Project), EU funded research project. The Hydra project is co-funded by the European Commission within the Sixth Framework Programme under contract IST-2005-034891

In society

• Hydra, Saronic Islands, a Greek island. Hydra (Ύδρα ˈiðra is one of the Saronic Islands of Greece, located in the Aegean Sea between the Saronic Gulf and the Argolic
• Hydra, a city in Algeria. Hydra is a municipality in Algiers province, Algeria. It is located in Bir Mourad Raïs district, in the Plateau Algeria ( ar [[Arabic]] الجزائر, Al Jaza'ir ælʤæˈzæːʔir Amazigh: ⴷⵥⴰⵢⴻⵔ Dzayer) officially the People's
• The Hydra, a literary magazine once edited by Wilfred Owen. The Hydra was a Magazine produced by the patients of the Craiglockhart War Hospital, noteworthy for having been edited at one time by Wilfred Owen
• Hydra: The Revenge, a roller coaster at Dorney Park. Hydra the Revenge is a steel floorless Roller coaster at Dorney Park & Wildwater Kingdom in South Whitehall Township, Pennsylvania

In music

• Hydra Entertainment, hip hop record label. Hydra Entertainment is a Hip hop Record label specializing in Instrumental hip hop.
• Hydra Head Records, an independent record label. Hydra Head Records is an Independent record label which specializes in Heavy metal music founded in New Mexico by Aaron Turner (the frontman
• Hydra (Iris Album) , an album by Synthpop band, Iris. Hydra is the latest album from Synthpop band Iris. It was released on 25th March 2008 through Diffusion Records
• Hydra (album), an album by Toto. Hydra is the second studio album by American rock band Toto. It was released in 1979 Track listing All Songs
• Hydra (band), a Southern Rock band. Hydra is a North American Southern rock band founded in the late 1960s by Spencer Kirkpatrick ( Guitar) Wayne Bruce ( vocals / Guitar
• Hydra (Satariel album), an album by Satariel. Hydra is the third studio album by the Melodic death metal band Satariel Satariel is a Melodic death metal band from Sweden founded in 1993 in Boden.

In fiction

• HYDRA, a secret criminal organization in the Marvel Universe. HYDRA is a fictional terrorist organization in the Marvel Universe.
  • …led by Viper (Madame Hydra), a Marvel supervillian, and enemy of the Avengers. Madame Hydra, also known as Viper, is a Fictional character in the Marvel Comics universe who is a foe of the Avengers and the
• Hydra (Transformers), one of several Transformers characters. Hydra is the name given to two Fictional characters in the various Transformers universes.
• The Hydra, a Cthulhu Mythos deity created by Henry Kuttner. The Henry Kuttner deities are Supernatural entities created for the Cthulhu Mythos universe of shared fiction by horror writer Henry Kuttner.
  • Mother Hydra, co-ruler of the Deep One race and consort of Father Dagon in the fictional Cthulhu mythos. The Deep Ones are fictional creatures in the Cthulhu Mythos of H
• The Hydra flak tank in the Warhammer 40,000 universe. The following text describes vehicles used by the Imperium in the fictional Warhammer 40000 universe
• Hydra, a DHARMA Initiative station on the TV series Lost. The Dharma Initiative is a fictional research project featured in the American Television series Lost is an Emmy and Golden Globe award-winning American serial drama television series.

Other

Hydra may also be used for:

• Hydra, a performance-based CPA advertising affiliate network.
• Hydra e. V. , a German prostitutes' organization, see German Hydra e.V. Wikipedia article.

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