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3 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 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 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.
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From: Webster's Revised Unabridged Dictionary (1913)

 Fis·su·rel·la n.  Zool. A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also keyhole limpet.
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From: WordNet (r) 2.0

 keyhole limpet
      n : marine limpet having a conical shell with an opening at the
          apex [syn: Fissurella apertura, Diodora apertura]