Definition of metros:
(n) :
(general) A rapid transit rail transport system, or a train in such systems, generally underground and serving a metropolitan area.
(n) :
(less common) An urban rapid transit rail transport system, normally with lighter track and light trains (i.e. an S-Bahn or similar), or a train in such systems.
(n) :
A metropolitan area.
(adj) :
metropolitan
(n) :
A city in Lampung, Indonesia.