corridor

Concise Oxford English Dictionary © 2008 Oxford University Press:
corridor/ˈkɒrɪdɔː(r)/

▶noun

• 1 a long passage from which doors lead into rooms.

  ■ Brit. a passage along the side of a railway carriage giving access to compartments.

• 2 a belt of land linking two other areas or following a road or river.

– phrases
the corridors of power the senior levels of government or administration.

– origin C16: from Fr., from Ital. corridore, alt. (by assoc. with corridore ‘runner’) of corridoio ‘running-place’, from correre ‘to run’, from L. currere.