Sliding or hinged door that is flush with the surface of a floor, ceiling, or roof
For other uses, see Trapdoor (disambiguation).
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A trapdoor to a bomb shelter from World War II
A trapdoor is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof.[1] It is traditionally small in size.[2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time.[3] The trapdoor has played a pivotal function in the operation of the gallows, cargo ships, trains,[4] booby traps,[5] and more recently theatre and films.[6][7]
^Oxford English Dictionary 2nd ed
^"TRAPDOOR | meaning in the Cambridge English Dictionary". Dictionary.cambridge.org. 2022-05-25. Retrieved 2022-05-31.
^"Greens Mill". Archived from the original on 2010-11-17.
^"Federal Register :: Request Access".
^When the Burgular Goes a-Burgling. Popular Science October 1919, Page 43.
^"Trap Doors On Stage". Theatrecrafts.com. Retrieved 12 November 2018. A set of triangular sprung flaps in the stage floor through which an actor can be propelled from a lift below stage.
A trapdoor is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. It is traditionally small in size. It was invented...
In theoretical computer science and cryptography, a trapdoor function is a function that is easy to compute in one direction, yet difficult to compute...
trapdoor is a form of breech-loading mechanism for rifles in which a hinged breechblock rotates up and forward, resembling the movement of a trapdoor...
Trapdoor spider is a common name that is used to refer to various spiders from several different groups that create burrows with a silk-hinged trapdoor...
that construct burrows with a cork-like trapdoor made of soil, vegetation, and silk. They may be called trapdoor spiders, as are other, similar species...
the fifth variation of the Allin trapdoor design, and was named for its hinged breechblock, which opened like a trapdoor. The infantry rifle model featured...
Aptostichus barackobamai (also known as the Barack Obama trapdoor spider) is a large species of trapdoor spider in the family Euctenizidae named after the 44th...
thereupon commence: Don't you open that trapdoor, you're a fool if you dare! Stay away from that trapdoor, 'cause there's something down there... Creepy...
Bothriocyrtum californicum, the California trapdoor spider, is a species of spider in the family Halonoproctidae. It is found in the United States. Males...
hourglass spider (which generally refers to its genus), is a species of trapdoor spider of the genus Cyclocosmia, which refers specifically to mygalomorphus...
Jason E. (2021), "Taxonomic revision of the New World members of the trapdoor spider genus Ummidia Thorell (Araneae, Mygalomorphae, Halonoproctidae)"...
The Chinese mystery snail, black snail, or trapdoor snail (Cipangopaludina chinensis), is a large freshwater snail with gills and an operculum, an aquatic...
Migas plomleyi, also known as Plomley's trapdoor spider, is a species of tree trapdoor spider in the Migidae family. It is endemic to Australia. It was...
The Nihoa trapdoor spider or Nihoa mahina is a trapdoor spider endemic to Nihoa, Hawaii. These spiders are hunters that dig a hole near rocks cover it...
continents except Antarctica. Many members are known as trapdoor spiders due to their creation of trapdoors over their burrows. Other prominent groups include...
Idiopidae, also known as armored or spiny trapdoor spiders, is a family of mygalomorph spiders first described by Eugène Simon in 1889. Idiopidae build...
Aptostichus angelinajolieae, the Angelina Jolie trapdoor spider, is a species of Euctenizidae, nocturnal arthropods who seize their prey after leaping...
Idioctis yerlata, also known as the intertidal trapdoor spider, is a species of mygalomorph spider in the Barychelidae family. It is endemic to Australia...
Idiosoma nigrum, also called black rugose trapdoor spider, occurs only in south-western Western Australia, in dry woodlands east of the Darling Scarp and...
century. It was the final design in a long line of rifles which used the trapdoor breechblock design developed by Erskine S. Allin in the 1860s and the last...
several model "trapdoor Springfields", which used the trapdoor breechblock design developed by Erskine S. Allin. Originally, the trapdoor Springfields were...
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