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Key"hole°
(), n.
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.
Keyhole limpet (Zol.), 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 (Zol.), 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.
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