Of little breadth; not wide or broad; having little distance from side to side; as, a narrow board; a narrow street; a narrow hem.(adjective)
source: webster1913
noun (n)
a narrow strait connecting two bodies of water(noun.object)
source: wordnet30
A narrow passage; esp., a contracted part of a stream, lake, or sea; a strait connecting two bodies of water; -- usually in the plural; as, The Narrows of New York harbor.(noun)