Definition Of keyhole
a hole in a lock into which the key is inserted.
Selecting one, he inserted it into the keyhole and turned.
Example Of keyhole
A cylindrical lockset fits into a large hole bored into the door's face with the keyhole in the door knob.
a white dress with a keyhole back
Allison was dressed in a completely red bodice with dramatic keyhole front, draped waist, and cascading front tulip hemline.
Astoundingly, the keyhole offers a direct line of sight to the Vatican, as if to keep an unflinching eye on the Church.
But he follows his obsession, and goes to great lengths in doing so, peeping through keyholes and lurking in the bushes with binoculars in an effort to satisfy his curiosity.