Hydra
An English word for a persistent, multi-faceted problem that generates new difficulties when any part of it is addressed, derived from the Lernaean Hydra slain by Heracles
The Meaning of Hydra
The word "hydra" derives from the Lernaean Hydra, a serpentine water monster that Heracles faced as his second labour. The Hydra dwelt in the swamps near the lake of Lerna in the Argolid and possessed multiple heads — the exact number varies from five to one hundred depending on the source. Its most terrifying feature was regeneration: when one head was severed, two new heads grew in its place, making conventional combat futile. One head was immortal and could not be destroyed at all. Heracles defeated the Hydra with the help of his nephew Iolaus: each time Heracles cut off a head, Iolaus cauterised the stump with a burning brand, preventing regrowth. The immortal head was buried under a massive rock. Heracles then dipped his arrows in the Hydra's venomous blood, creating weapons of unparalleled lethality. The word "hydra" entered English to describe any problem that multiplies when attacked — bureaucratic regulations, terrorist networks, drug trafficking operations, and computer viruses are all commonly described as hydra-headed. The genus name Hydra is also used in biology for freshwater organisms with remarkable regenerative abilities.
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None recorded
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Fun Fact
The biological organism Hydra was named after the mythological monster because it exhibits genuine regeneration — if cut in half, each piece grows into a complete new animal
Words We Inherited
English words and phrases that trace back to this myth. See our full guide to English words from Greek mythology.
Explore Further
Beasts & Monsters
💭 conceptMonstrosity, boundary, trial
The creatures of Greek myth — from the Hydra to the Sphinx, from Pegasus to the Minotaur — each a living boundary between the human world and something older and wilder.
Hydra
🐉 creatureMulti-headed serpent of Lerna
A monstrous water serpent with multiple heads that grew two more whenever one was cut off. Slaying the Hydra was Heracles's second labor.
Perseus and Medusa
💭 conceptNarrative
The hero's quest to slay the mortal Gorgon and his ingenious use of divine gifts to accomplish the impossible
Ophiuchus
💭 conceptastronomy, healing
The serpent-bearer constellation identified with Asclepius, who learned to resurrect the dead and was placed in the sky by Zeus after being struck down for overstepping mortal limits.
Lernaean Hydra
🐉 creatureMany-headed water serpent
The Hydra was a gigantic water serpent with multiple heads — when one was severed, two more grew in its place, making it seemingly impossible to kill.
Minotaur
💭 conceptMythology and architecture
The bull-headed monster imprisoned in the Labyrinth of Crete, whose myth gave English the concept of the labyrinth as a place of confusion and entrapment
God of Healing
💭 conceptHealing, medicine, plague, purification
Apollo and his son Asclepius govern healing — Apollo as the source of medical knowledge and Asclepius as its practitioner.
Typhoon
💭 conceptLanguage and meteorology
A term for a tropical cyclone in the western Pacific, partially derived from Typhon, the monstrous storm giant of Greek mythology who challenged Zeus for supremacy
Theseus and the Minotaur
💭 conceptNarrative
The Athenian hero's descent into the Labyrinth to slay the bull-headed monster and liberate Athens from its blood tribute
Sybaris
🐉 creaturemonsters
A monstrous serpent-dragon that terrorised the region around Delphi until slain by a young hero
Pharmakon
💭 conceptThe substance that is both cure and poison
The Greek word that means simultaneously medicine and poison — a concept that embodies the duality at the heart of all power.
The Twelve Labours
💭 conceptHeroism, endurance, redemption
Twelve impossible tasks imposed on Heracles by King Eurystheus as penance for killing his own family in a madness sent by Hera.