metro

Noun
  1. An electric railway operating below the surface of the ground (usually in a city) (synset 103762667)
    "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
    is a type of: railroad, railroad line, railway, railway line, railway system - line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight
    same as: subway, subway system, tube, underground

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