AskDefine | Define hydra

Dictionary Definition



1 (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones; "Hydra was slain by Hercules"
2 a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer [syn: Snake]
3 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"
4 small tubular solitary freshwater hydrozoan polyp

User Contributed Dictionary



  • , /ˈhaɪdrə/, /"haIdr@/


  1. 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.


any of several small freshwater polyps of the genus Hydra and related genera



  • /ˈhʏːd.ra/


(masculine hydrus)
  1. A water-snake.

Related terms

Extensive Definition

Hydra may refer to:
  • Lernaean Hydra, a mythological many-headed serpent
  • hydra-, an alternate spelling of the suffix hydro-, referring to water.
It may also refer to:

In science

In technology

In society

In music

In fiction


Hydra may also be used for:
hydra in Catalan: Hidra
hydra in Czech: Hydra (rozcestník)
hydra in Danish: Hydra
hydra in German: Hydra
hydra in Estonian: Hydra
hydra in Spanish: Hidra
hydra in Esperanto: Hidro
hydra in Finnish: Hydra
hydra in French: Hydra
hydra in Korean: 히드라
hydra in Croatian: Hidra
hydra in Italian: Idra
hydra in Latin: Hydra
hydra in Luxembourgish: Hydra
hydra in Latvian: Hidra
hydra in Hungarian: Hydra
hydra in Dutch: Hydra
hydra in Japanese: ヒドラ
hydra in Norwegian: Hydra
hydra in Low German: Hydra
hydra in Polish: Hydra (ujednoznacznienie)
hydra in Portuguese: Hidra
hydra in Russian: Гидра
hydra in Slovak: Hydra
hydra in Slovenian: Hidra
hydra in Thai: ไฮดรา
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