Corridor \Cor"ri*dor\ (k?r"r?-d?r or -d?r), n. [F., fr. Itt. corridpore, or Sp. corredor; prop., a runner, hence, a running or long line, a gallery, fr. L. currere to run. See Course.]

1. (Arch.) A gallery or passageway leading to several apartments of a house.

2. (Fort.) The covered way lying round the whole compass of the fortifications of a place. [R.]

Source: Webster's Revised Unabridged Dictionary (1913)