Hydra generally refers to: *

Lernaean Hydra The Lernaean Hydra or Hydra of Lerna ( grc-gre, Λερναῖα Ὕδρα, ''Lernaîa Hýdra''), more often known simply as the Hydra, is a snake, serpentine water monster in Greek mythology, Greek and Roman mythology. Its lair was the lake of Le ...

, a many-headed serpent in Greek mythology * ''Hydra'' (genus), a genus of simple freshwater animals belonging to the phylum Cnidaria Hydra or The Hydra may also refer to:

Astronomy

Hydra (constellation) Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees, and also the longest at over 100 degrees. Its southern end borders Libra (constellation), Libra and Centaurus (constellation), Centaurus and its northern end bo ...

Hydra (moon) Hydra is a natural satellite of Pluto, with a diameter of approximately across its longest dimension. It is the second-largest moon of Pluto, being slightly larger than Nix. Hydra was discovered along with Nix by astronomers using the Hubble S ...

, a satellite of Pluto

Computing

Hydra (chess) Hydra was a chess machine, designed by a team with Dr. Christian "Chrilly" Donninger, Dr. Ulf Lorenz, GM Christopher Lutz and Muhammad Nasir Ali. Since 2006 the development team consisted only of Donninger and Lutz. Hydra was under the patrona ...

, a chess computer *

Hydra (digital repository) Samvera, originally known as Hydra, is an open-source digital repository software product. Samvera main components are Fedora Commons, Solr, Blacklight, and HydraHead (a Ruby on Rails plugin and gem, respectively). Each Samvera implementatio ...

Hydra (operating system) Hydra (stylized as HYDRA) is an early, discontinued, capability-based, object-oriented microkernel designed to support a wide range of possible operating systems to run on it.Wulf 74 pp. 337–345 Hydra was created as part of the C.mmp project at ...

Hydra (software) Hydra (or THC Hydra) is a parallelized network login cracker built in various operating systems like Kali Linux, Parrot and other major penetration testing environments. Hydra works by using different approaches to perform brute-force attacks in ...

Hydra 100 HYDRA Engine is a brand name for a multi-Graphical Processing Unit, GPU developed by Lucid Logix. Similar to nVidia's Scalable Link Interface, SLI and ATI Technologies, ATI's ATI CrossFire, Crossfire-technologies, Hydra allows linking several video ...

, a multi-GPU hardware solution * HYDRA Game Development Kit, a development system by André LaMothe *

Razer Hydra The Razer Hydra (previously known as Sixense TrueMotion) is a motion In physics, motion is the phenomenon in which an object changes its position with respect to time. Motion is mathematically described in terms of displacement, distance, vel ...

, a game controller *

NEC HYDRAstor NEC HYDRAstor is a disk-based grid storage system with data deduplication for backups and archiving, developed by NEC Corporation. A HYDRAstor storage system can be composed of multiple nodes, starting from one up to 100+ nodes. Each node contains ...

, a storage system

Fictional entities

* Hydra (comics), a fictional organization in the Marvel Universe **

Hydra (Marvel Cinematic Universe) The Marvel Cinematic Universe (MCU) is an American media franchise and shared universe centered on superhero films and other series starring various titular superheroes independently produced by Marvel Studios and based on characters that appea ...

, an organisation in the Marvel Cinematic Universe based on the comics counterpart * Hydra (''Dungeons & Dragons''), a fictional monster in ''D&D'' * Hydra (''Transformers''), a character in ''Transformers'' * The Hydra, a fictional organization in ''

The Phantom ''The Phantom'' is an American adventure comic strip, first published by Lee Falk in February 1936. The main character, the Phantom, is a fictional costumed crime-fighter who operates from the fictional African country of Bangalla. The ch ...

'' * Hydra, a character in ''

UFO Ultramaiden Valkyrie is a Japanese manga series created by Kaishaku. The series was adapted into a 32-episode anime series and one specially released OVA episode by TNK. Seasons 1 and 2 were broadcast in Japan on Kids Station between 2002 and 2004. The anime s ...

'' * The Hydra, a fictional deity created by Henry Kuttner ** Mother Hydra, the co-ruler of the

Deep One The Deep Ones are creatures in the Cthulhu Mythos of H. P. Lovecraft. The beings first appeared in Lovecraft's novella ''The Shadow over Innsmouth'' (1931), but were already hinted at in the early short story "Dagon". The Deep Ones are a race o ...

race in the Cthulhu Mythos * The Hydra, a fictional fighter jet in '' Grand Theft Auto: San Andreas'' and ''Grand Theft Auto Online'' * The Hydra, a fictional machine in ''

Kirby Air Ride ''Kirby Air Ride'', known in Japan as , is a 2003 racing video game starring Kirby, developed by HAL Laboratory and published by Nintendo for the GameCube. ''Kirby Air Ride'' has the players and computer-controlled racers ride on Air Ride Mac ...

Film and television

* '' Hydra'' (film), a 2008 monster movie * Hydra (''Chuck''), a fictional database on ''Chuck'' * Hydra, a fictional

Dharma Initiative The Dharma Initiative, also written DHARMA (Department of Heuristics and Research on Material Applications), is a fictional research project and organization featured in the television series '' Lost''. It was introduced in the second season epi ...

station on ''Lost''

Music

Hydra Entertainment Hydra Entertainment is a hip hop record label specializing in Instrumental hip hop. They are most notable for their ''Hydra Beats'' series of instrumental albums by prominent hip hop producers. All of its releases are out of print. Hip hop grou ...

, the hip-hop record label *

Hydra (band) Hydra is an American Southern rock band founded in 1970 by Spencer Kirkpatrick (guitar), Wayne Bruce (vocals and guitar), Steve Pace (drums) and Orville Davis (bass). In 1977, it became a three-piece band (with Wayne Bruce now on bass) and the ba ...

, an American southern rock band in the 1970s * ''Hydra'' (Otep album), 2013 * Hydra, a 2005 album by

Satariel (band) Satariel is a death metal band from Sweden founded in 1993 in Boden. History Satariel recorded its first demo in 1994; titled ''Thy Heavens' Fall'', which consisted of traditional black metal sounds. The band released their debut album, '' ...

* ''Hydra'' (Toto album),1979, or the title song * ''Hydra'' (Within Temptation album), 2014 * ''Hydra'' (Iris album), a 2008 album by Iris * "Hydra", a 2000 song by Dir En Grey from ''

Macabre In works of art, the adjective macabre ( or ; ) means "having the quality of having a grim or ghastly atmosphere". The macabre works to emphasize the details and symbols of death. The term also refers to works particularly gruesome in natur ...

'' * "Hydra", a song by Twilight Force from the 2019 album ''

Dawn of the Dragonstar ''Dawn of the Dragonstar'' is the third studio album by the Swedish power metal band Twilight Force. It was released on August 16, 2019. It is the band's second album with Nuclear Blast Records, the first to feature vocalist Allyon, and the last ...

'' * "HYDRA", a 2018 song by

Myth & Roid Myth & Roid (stylized in all caps) is a Japanese pop rock band centered arounTom-H@ck(guitars, bass, composer, production) and hotaru (keyboards, lyrics, story planning), featuring multiple vocalists. The band made its debut in 2015 with the re ...

People

* Hydra (skater), roller derby skater * Hydra (wrestler), American professional wrestler

Places

* Hydra, Algeria, a neighbourhood and a municipality in Algiers *

Hydra (island) Hydra, or Ydra or Idra ( el, Ύδρα, Ýdra, , Arvanitika: Nύδρα/Nidhra), is one of the Saronic Islands of Greece, located in the Aegean Sea between the Myrtoan Sea and the Argolic Gulf. It is separated from the Peloponnese by a narrow s ...

, an island of Greece

Ships

* ''Hydra'' (ship), a hydrogen ship * Greek ironclad ''Hydra'', a French-built ironclad warship launched in 1889 * Greek destroyer ''Hydra'', a ''Dardo''-class destroyer launched in 1932 * Greek frigate ''Hydra'', a ''MEKO 200''-type frigate launched in 1992, lead ship of the ''Hydra'' class frigate * HMS ''Hydra'' (1797), a 38-gun fifth rate * HMS ''Hydra'' (1838), a wooden steam paddle sloop ** ''Hydra''-class sloop, a class of British steam sloops * HMS ''Hydra'' (1871), a Cyclops-class turret ship * HMS ''Hydra'' (1912), an Acheron-class destroyer * HMS ''Hydra'' J275), an Algerine-class minesweeper launched in 1942 * HMS ''Hydra'' (A144), an oceanographic survey vessel launched in 1965 * Hydra-class minelayer, a class of Dutch 1910s minelayers

Other uses

* ''

The Hydra ''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, and for including poems by Siegfried Sassoon. The magazine was headquartered in Edinburgh. ...

'', a literary magazine * Hydra (association), a German self-help and advocacy group for prostitutes * ''Hydra'' (video game), an arcade and Atari Lynx video game *

Hydra game In mathematics, specifically in graph theory and number theory, a hydra game is a single-player iterative mathematical game played on a mathematical tree called a ''hydra'' where, usually, the goal is to cut off the hydra's "heads" while the hyd ...

, a concept in mathematical logic *

Hydra Market Hydra was a Russian language dark web marketplace that facilitated trafficking of illegal drugs as well as financial services including cryptocurrency tumbler, cryptocurrency tumbling for money laundering and exchange services between cryptocurr ...

, a Russian language dark web marketplace that facilitated trafficking of illegal drugs as well as financial services * Hydra the Revenge, a roller coaster at Dorney Park in Pennsylvania, US *

Hydra 70 The Hydra 70 rocket is a diameter fin-stabilized unguided rocket used primarily in the air-to-ground role. It can be equipped with a variety of warheads, and in more recent versions, guidance systems for point attacks. The Hydra is widely used by ...

, an air-to-ground rocket * Hydra Technologies, an unmanned aerial vehicle firm *

Hydra Trophy The Hydra Trophy is the trophy awarded to the Women's Flat Track Derby Association (WFTDA) team that wins the WFTDA Championship Tournament at the conclusion of every WFTDA roller derby season. Named in honor of Hydra Hydra generally refers to ...

, a trophy of the roller derby WFTDA Championships * Hydra, a wireless station during World War II at

Camp X Camp X was the unofficial name of the secret Special Training School No. 103, a Second World War British paramilitary installation for training covert agents in the methods required for success in clandestine operations. It was located on the ...

* Operation Hydra (Yugoslavia) *

Operation Hydra (1943) Operation Hydra was an attack by RAF Bomber Command on a German scientific research centre at Peenemünde on the night of 17/18 August 1943. Group Captain John Searby, commanding officer of No. 83 Squadron RAF, commanded the operation, the fi ...