keyhole Meaning, Definition & Usage

  1. noun the hole where a key is inserted

WordNet

Key"hole` noun
Definitions
  1. A hole or apertupe in a door or lock, for receiving a key.
  2. (a) (Carp.) A hole or excavation in beams intended to be joined together, to receive the key which fastens them. (b) (Mach.) a mortise for a key or cotter.

Webster 1913