noun (n)

• (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones

  (mitologi yunani) monster dengan kepala sembilan; bila dipukul dari setiap kepala telah diganti oleh dua orang baru

  Example:
  Hydra was slain by Hercules.
  

  source: wordnet30
• a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer

  panjang percaturan pingsan di belahan bumi selatan berhampiran khatulistiwa peregangan antara virgo dan kanser

  Synonym:
  snake
  

  source: wordnet30
• trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality

  masalah itu tidak diatasi oleh satu usaha karena jaraknya banyak aspek atau its gigih dan kualiti yang berleluasa

  Example:
  We may be facing a hydra that defies any easy solution.
  

  source: wordnet30
• small tubular solitary freshwater hydrozoan polyp

  kecil berumbung soliter hydrozoan polyp air tawar

  source: wordnet30
• 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.

  ular atau monster di danau atau dari lerna marsh, in the peloponnesus, diwakili dengan memiliki banyak kepala, salah satu yang, saat memotong, adalah segera berhasil oleh dua orang lain, kecuali cedera itu dibakar. ia dibunuh oleh hercules. maka, monster yang payah.

  source: webster1913