στενόςstenós, sten-os'; probably from the base of G2476; narrow (from obstacles standing close
about):—strait.
Thayer's Greek Lexicon
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STRONGS G4728:
στενός, στενή, στενόν, from Aeschylus and Herodotus down, the Sept. for צַר, narrow, strait: πύλη, Matthew 7:13 (14 (here LTr brackets πύλη)); Luke 13:24.