metro

Từ điển WordNet v3.1 - WordNet Dictionary

noun

an electric railway operating below the surface of the ground (usually in a city) (Freq. 1)
- in Paris the subway system is called the 'metro' and in London it is called the 'tube' or the 'underground'
• Syn:
tube, underground, subway system, subway
• Hypernyms:
railway, railroad, railroad line, railway line, railway system

• Từ đồng nghĩa / Synonyms:
  tube, underground, subway system, subway