hydra

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. 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
• Hypernyms:
trouble, problem
2. small tubular solitary freshwater hydrozoan polyp
• Hypernyms:
hydrozoan, hydroid
• Member Holonyms:
genus Hydra

• Từ đồng nghĩa / Synonyms:
  Hydra, Snake