semitones is a form of:

Keyhole



noun
1.
(the hole by which a key is put into a lock) រន្ធសោរ
ENGLISH MEANING
noun
1.
A mortise for a key or cotter.
2.
A hole or apertupe in a door or lock, for receiving a key.
3.
A hole or excavation in beams intended to be joined together, to receive the key which fastens them.