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From The Collaborative International Dictionary of English v.0.48:
Keyhole \Key"hole`\, n. 1. A hole or apertupe in a door or lock, for receiving a key. [1913 Webster] 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. [1913 Webster] Keyhole limpet (Zool.), 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 (Zool.), 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. [1913 Webster]