A hole in a lock into which the key is inserted
A saw with a long, narrow blade for cutting small holes such as keyholes
A metal plate which covers a keyhole, or a bolt which is inserted into it, so as to block the view through the hole, prevent tampering with the lock, stop draughts, etc.
A small slit resembling a keyhole.
(The name of) a small nebula in the southern sky surrounding the variable star η Carinae, with a dark central region shaped like a keyhole.
Having the shape of a keyhole.
Any of various sand dollars having one or more elongated perforations in the test and belonging to the family Mellitidae or related families; especially one of the genus Mellita of the Atlantic coasts of America.
A limpet which has an aperture at the apex of the shell, sometimes extending to the margin
Minimally invasive surgery carried out through a very small incision, with special instruments and techniques including fibre optics
A plate of metal surrounding a keyhole which prevents the surface of the door, drawer, etc., in which it is set from being scratched or otherwise damaged by the key.
A neckline with a circle, oval, or slit cut into or near the front or back, giving a shape resembling a keyhole.