METRO
metro, tube, underground, subway system, subway
(noun) an electric railway operating below the surface of the ground (usually in a city); “in Paris the subway system is called the ‘metro’ and in London it is called the ‘tube’ or the ‘underground’”
Source: WordNet® 3.1
Etymology 1
Noun
metro (plural metros)
An underground railway.
A train that runs on such an underground railway.
An urban rapid transit light railway
A train that runs on such a railway.
Synonyms
• (underground railway): subway, Tube (the London Underground), underground (UK), underground railway (UK)
Etymology 2
Noun
metro (plural metros)
a metropolitan area
Adjective
metro (comparative more metro, superlative most metro)
metropolitan
Anagrams
• Moret, Tomer, Tormé
Source: Wiktionary