Keyhole
Keyhole , noun
1.
A hole or aperture in a door or lock, for receiving a key.
2.
(a) (Carpentry) A hole or excavation in beams intended to be joined together, to receive the key which fastens them.
(b)
(Carpentry) a mortise for a key or cotter.
Collocations (3)
Keyhole limpet (Zoology) , a marine gastropod of the genus Fissurella and allied genera. See Fissurella.
Keyhole saw , a narrow, slender saw, used in cutting keyholes, etc., as in doors; a kind of compass saw or fret saw.
Keyhole urchin (Zoology) , any one of numerous clypeastroid sea urchins, of the genera Melitta, Rotula, and Encope; -- so called because they have one or more perforations resembling keyholes.