What does the word keyhole mean?

Usage examples for keyhole

  1. There was a pause, during which Irene, holding her handkerchief to her lips, crept to the connecting door and stood with her ear close to the keyhole. – The Desired Woman by Will N. Harben
  2. " But," he added, " one would say that an all little light came through the keyhole." – The Golden Silence by C. N. Williamson and A. M. Williamson
  3. Presently a voice came through the keyhole, in a whisper. – The Adventures of a Three-Guinea Watch by Talbot Baines Reed