American English

Definition of metro noun from the Oxford Advanced American Dictionary

 

metro

 noun
noun
NAmE//ˈmɛtroʊ//
 
(pl. metros) (also the Metro [singular])
 
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an underground train system, for instance the ones in Paris and Washington, D.C. to travel on the metro the Paris Metro a metro station
See the Oxford Advanced Learner's Dictionary entry: metro