Definition of keyholes:
(n) :
The hole in a lock where the key is inserted and turns.
(n) :
Any small opening resembling the hole for a key in shape or function; especially, one that gives a vista of, or access to, a space beyond.
(n) :
(basketball) The free-throw lane together with the circle surrounding the free-throw line; key.
(n) :
A small incision through which surgical instruments can reach into an anatomic space beyond.
(n) :
(carpentry) A hole or excavation in beams intended to be joined together, to receive the key that fastens them.
(n) :
(engineering) A mortise for a key or cotter.