[1] : 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
see also:
keyhole limpet fissurella keyhole saw keyhole urchin melitta rotula 
encope 

[2] : The Collaborative International Dictionary of English v.0.48

fissurella \fis`surel"la\, n. nl., dim. of l. fissura a
   fissure. zool.
   a genus of marine gastropod mollusks, having a conical or
   limpetlike shell, with an opening at the apex; -- called also
   keyhole limpet.
   1913 webster
see also:
keyhole limpet 

[3] : WordNet (r) 2.0

keyhole limpet
     n : marine limpet having a conical shell with an opening at the
         apex syn: fissurella apertura, diodora apertura
see also:
fissurella apertura diodora apertura 

Keyhole Limpet >> K Words
Keyhole Limpet, definition of term: Keyhole Limpet
keyhole+limpet_pag1.html

Limpet >> L Words
Limpet, definition of term: Limpet
limpet_pag1.html

Keyhole >> K Words
Keyhole, definition of term: Keyhole
keyhole_pag1.html