trap door

from WordNet (r) 3.0 (2006)

trap door
    n 1: a hinged or sliding door in a floor or ceiling

from Jargon File (4.4.4, 14 Aug 2003)

trap door
 n.

   (alt.: trapdoor)

   1. Syn. {back door} -- a {Bad Thing}.

   2. [techspeak] A trap-door function is one which is easy to compute
   but very difficult to compute the inverse of. Such functions are {Good
   Thing}s with important applications in cryptography, specifically in
   the construction of public-key cryptosystems.

from The Free On-line Dictionary of Computing (8 July 2008)

trap door

   Or "trapdoor" 1. {back door}.

   2. {trap-door function}

from Moby Thesaurus II by Grady Ward, 1.0

34 Moby Thesaurus words for "trap door":
      French door, archway, back door, barway, bulkhead,
      carriage entrance, cellar door, cellarway, door, doorjamb,
      doorpost, doorway, front door, gate, gatepost, gateway, hatch,
      hatchway, lintel, porch, portal, porte cochere, postern,
      propylaeum, pylon, scuttle, side door, stile, storm door,
      threshold, tollgate, trap, turnpike, turnstile

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