hydra

Noun

• small tubular solitary freshwater hydrozoan polyp

• 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
    

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

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

Related words

• Synonyms: 
  Hydra , Snake