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Longman Dictionary of Contemporary English
trapdoor
noun
EXAMPLES FROM CORPUS
▪ At the top of the spiral staircases are two wooden trapdoors leading on to the battlements.
▪ He was certain he had found a cleverly concealed trapdoor.
▪ Internal access to this lower room was obtained through a trapdoor in the floor of the drop room.
▪ The trapdoor above 1c is closed but unlocked.
▪ They might ambush you when you stuck your head up a trapdoor and stab you with a pike.
▪ They went from door to door, questioning everyone, systematically searching for trapdoors.
▪ They were careful with each other; they did not talk about the sadness or the sudden trapdoor feeling in their stomachs.
The Collaborative International Dictionary
Trapdoor

Trapdoor \Trap"door`\, n.

  1. (Arch.) A lifting or sliding door covering an opening in a roof or floor.

  2. (Mining) A door in a level for regulating the ventilating current; -- called also weather door.
    --Raymond.

    Trapdoor spider (Zo["o]l.), any one of several species of large spiders which make a nest consisting of a vertical hole in the earth, lined with a hinged lid, like a trapdoor. Most of the species belong to the genus Cteniza, as the California species ( Cteniza Californica).

Wiktionary
trapdoor

n. 1 A hinged or sliding door set into a floor or ceiling. 2 (context theater English) Such a trap set into the floor of a stage to allow fast exits and entrances. 3 (context computing English) A secret method of obtaining access to a program or online system; a backdoor. 4 (context mathematics cryptography English) The special information that permits the inverse of a trapdoor function to be easily computed. 5 (context mining English) A door in a level for regulating the ventilating current; weather door.

Wikipedia
Trapdoor

A trapdoor is a sliding or hinged door, flush with the surface of a floor, roof, or ceiling, or in the stage of a theatre. A hatch, an opening which may also be in a wall and need not be flush with the surface, is similar; in some cases either name is applicable. A small door in a wall, floor or ceiling used to gain access to equipment is called an access hatch or access door.

Trapdoor (disambiguation)

A trapdoor is a door set into a floor or ceiling.

Trapdoor or Trap Door may also refer to:

  • Trap Door (magazine), a science fiction fanzine
  • The Trap Door, a British animated TV series
  • The Trap Door (video game), a computer game based on the animated series
  • Trapdoor (software), a piece of computer software used for network administration
  • Trapdoor (company), a video game developer
  • Trapdoor function, a type of mathematical function used in cryptography
  • "Trapdoor", in computing, an outdated synonym for " backdoor", a method used to circumvent normal authorization
  • Trap Door (EP), an EP by T-Bone Burnett, or the title song
  • "Trap Door", a song by Ozzy Osbourne from Black Rain
  • "Trap Door" Springfield, a single-shot breechloading rifle designed and produced at Springfield Armory during the late 19th century.
  • Trapdoor spider, a spider
  • Trap Door Spiders, a literary society
Trapdoor (company)

Trapdoor Inc. is a Canadian independent games developer. Currently they have released one game, Warp, which is best known as the launch title for Xbox Live Arcade's "House Party" in 2012.

Trapdoor Inc are also known for their involvement with Fez. In 2011, Trapdoor, Inc. partnered with Polytron to co-publish Fez.

Sometime in Early April 2015, the web domain for Trapdoor's website expired and was bought by a Japanese blogger. Trapdoor did not take to social media about the incident. It is assumed that Trapdoor Inc is now defunct.

Usage examples of "trapdoor".

That trapdoor also snapped shut, leaving Burman gaping down at his torn clothing from which his expensive watch and equally expensive gold chain had been ripped away.

Doubling her body, she disappeared into a narrow trapdoor beneath the drumskin, and the drum began to glide back to its berth below the Fiata.

The opened trapdoor revealed a steep set of ladderlike steps, and cold and moist air washed over her as she descended.

They all wore rough fighting garb, leadier, and gambesons, but no metal armor, which would make noise and warn away someone coming up through the trapdoor.

Linemen told each other frontier stories, pioneer tales, of ghosts in the net, strange codes or secret trapdoors leading to fantastically detailed alien virtualities, odd conversations with disembodied people with no lookup addresses.

This one was about the size of the trapdoor spider on which the pepsis wasp had laid its egg.

Knights were smashing on the trapdoor with swords and battleaxes, and soon it would give way.

It would open a trapdoor under the deniers, and remove the only justification, however flimsy, for blocking the evacuation project.

It had rotted away from the screws that held it to the sidepieces near the bow and cracked right in two midway between that point of attachment and the first crosspiece, opening downward like a double trapdoor.

He slid open the panel of the instrument console, turned a knob, and trapdoors in the trunk of Black Beauty flew apart for the Hornet Scanner on its launching pad.

He cursed, grabbed for the control handle, but before he could swing the shield, a section of lawn the size of a street manhole lifted like a trapdoor behind the chigger and in the full glare of the handlight.

So, after Trapdoor had broken into CCU's computer Phate had driven from the Bay View Motel to this place, where his second laptop was warmed up and waiting for him, online via a virtually untraceable cell phone connection through a South Carolina Internet provider, linked to an anonymizing Net launch pad in Prague.

Most of the basic techniques of computer intrusion: password cracking, trapdoors, backdoors, trojan horses--were invented in college environments in the 1960s, in the early days of network computing.

Admirable wedges those tapering browned-iron blades would make to keep the trapdoor shut, the Mouser told himself.

Then with the help of Bufo and Dooly, he scraped away dirt and brush from atop what turned out to be a trapdoor made of heavy wooden planks, worm-eaten and dark from having been buried.