from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A hinged or sliding door in a floor, roof, or ceiling.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hinged or sliding door set into a floor or ceiling.
  • n. Such a trap set into the floor of a stage to allow fast exits and entrances.
  • n. A secret method of obtaining access to a program or online system; a backdoor.
  • n. The special information that permits the inverse of a trapdoor function to be easily computed.

from the GNU version of the Collaborative International Dictionary of English

  • n. A lifting or sliding door covering an opening in a roof or floor.
  • n. A door in a level for regulating the ventilating current; -- called also weather door.

from The Century Dictionary and Cyclopedia

  • n. In mining, a door designed to direct air-currents in ventilating systems, or to prevent, surface wind from deranging the normal direction of air-currents.
  • n. A door in a floor or roof which when shut is flush, or nearly so, with what surrounds it.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a hinged or sliding door in a floor or ceiling


from Wiktionary, Creative Commons Attribution/Share-Alike License

trap + door


  • Beneath the trapdoor was a ladder, which descended four meters to a landing at the top of a narrow stairwell.

    A Time to Kill

  • Under the trapdoor was a space two feet on either side, containing the ashes of some finery, and a black tin box.


  • Renegade334: I heard about this totally robust hack of Phates I mean totally and I saw him online and I asked him about it only he just dissed me. then Weird stuff started happening after that and I heard about this script he wrote called trapdoor and now Im totally paranoyd.

    The Blue Nowhere

  • GOODMAN: Thank you Mr Chair, this is a so-called trapdoor amendment I guess, um, and in a somewhat exhaustive search, first of all the courts presume that um that ah that sections of bills are severable apart from one another.

    Pam's House Blend - Front Page

  • The team used what is called a trapdoor function, which is generated by quasigroup string transformations based on multivariate quadratic quasigroups.

    ACM TechNews

  • Now, 'trapdoor' in the computer world means a hole built into a security system that lets the software designers get back inside to fix problems without needing a passcode.


  • One of her new ads compares the economy under President Bush to a "trapdoor," similar to a spot she used before Super Tuesday that used a falling skydiver as an economic metaphor.

    Clinton Seeks to Regroup in Ad Wars

  • This is simply a metal plate-a kind of trapdoor-built into the floor of the living room fireplace above a deep, bricklined pit.

    I'm A Stranger Here Myself

  • As the result of this study, I concluded that SKIPJACK does not contain any "trapdoor" and is not vulnerable to any short-cut method of attack.

    Testimony Concerning Computer Encryption And The "Clipper Chip" Before The U.S. House Of Representatives Subcommittee On Technology, Environment, And Aviation

  • Assuming of course that there’d be a convenient trapdoor aka Lost with a supply of coffee and chocolate hob-nobs.

    Archive 2007-10-01


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