noun
an electric railway operating below the surface of the ground (usually in a city)
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in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'
• Syn: ↑metro, ↑tube, ↑underground, ↑subway
• Hypernyms: ↑railway, ↑railroad, ↑railroad line, ↑railway line, ↑railway system
Useful english dictionary. 2012.