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Sliding or hinged door that is flush with the surface of a floor, ceiling, or roof
A trapdoor or hatch 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
Trapdoor
One-way cryptographic tool
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_function
Topics referred to by the same term
Look up trapdoor in Wiktionary, the free dictionary. A trapdoor is a door set into a floor or ceiling. Trapdoor or Trap Door may also refer to: Trap Door
Trapdoor_(disambiguation)
Method of reloading and firing a single-shot rifle
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_mechanism
Index of animals with the same common name
Trapdoor spider is a common name for various spiders from several different groups that create burrows with a silk-hinged trapdoor to help them ambush
Trapdoor_spider
A trapdoor maneuver in financial restructuring refers to a technique that moves collateral into unrestricted subsidiaries and out of reach of existing
Trapdoor_(finance)
Term for several American rifles
58-60 caliber trapdoor rifle. Springfield Model 1866 – .50-70 caliber trapdoor rifle. Springfield Model 1868 – .50-70 caliber trapdoor rifle. Springfield
Springfield_rifle
US service rifle from late 1800s
The Springfield Model 1873 was a trapdoor breechblock service rifle produced by the Springfield Armory for the United States military. It was the first
Springfield_model_1873
Species of trap-door spider
malayanus, also known as the Malayan black trapdoor spider or the black armored trapdoor spider, is a species of trapdoor spider that is native to Malaysia. The
Liphistius_malayanus
Family of spiders
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
Ctenizidae
British stop-motion animated TV series
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
The_Trap_Door
Breech-loading rifle
The Springfield Model 1888 was a trapdoor breechblock service rifle produced by the Springfield Armory for the United States military. Introduced in 1888
Springfield_Model_1888
Executions that followed the Nuremberg Trials
condemned died from strangulation instead of a broken neck. Additionally, the trapdoor was so small that several of the condemned, including Keitel and Frick
Nuremberg_executions
Species of spider
zhū), commonly known as the Chinese hourglass spider, is a species of trapdoor spider of the genus Cyclocosmia. Cyclocosmia ricketti is native to China
Cyclocosmia_ricketti
Trapdoor spider from California named after Barack Obama
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
Aptostichus_barackobamai
California trapdoor spider
Bothriocyrtum californicum, the California trapdoor spider, is a species of spider in the family Halonoproctidae. It is found in the United States. Males
Bothriocyrtum_californicum
Spider family
Barychelidae, also known as brushed trapdoor spiders, is a spider family with about 300 species in 39 genera. Trittame loki in burrow closed burrow Most
Barychelidae
Species of spider
The Nīhoa trapdoor spider (Nihoa mahina) is a species of trapdoor spider in the family of Barychelidae that occurs on the island of Nīhoa, Hawaii in the
Nīhoa_trapdoor_spider
Rifle cartridge designed by the U.S. Army
the end of the American Civil War, and is known by collectors as the "Trapdoor Springfield".[citation needed] The original .45-70 loading was designated
.45-70
Infraorder of arachnids (spiders)
continents except Antarctica. Many members are known as trapdoor spiders due to their creation of trapdoors over their burrows. Other prominent groups include
Mygalomorphae
Family of spiders
Idiopidae, also known as armored or spiny trapdoor spiders, is a family of mygalomorph spiders first described by Eugène Simon in 1889. Idiopidae build
Idiopidae
Breech-loading rifle
Springfield Model 1866 was the second iteration of the Erskine S. Allin designed trapdoor breech-loading mechanism. Originally developed as a means of converting
Springfield_Model_1866
Breech-loading rifle
one of the rifles which used the trapdoor breechblock design developed by Erskine S. Allin. Originally, the trapdoor Springfields were created to convert
Springfield_Model_1868
2009 debut studio album by Twenty One Pilots
original on August 9, 2020. Retrieved December 10, 2019. "Twenty One Pilots – Trapdoor Live @ The Battle of the Bands 10–11–09". November 24, 2009. Archived from
Twenty_One_Pilots_(album)
Breech-loading rifle
Springfield Armory. It was a modification of the Springfield Model 1861 with trapdoor action. It was replaced by the Springfield Model 1866, which featured a
Springfield_Model_1865
1990 studio album by The Dead C
Trapdoor Fucking Exit is the third studio album by The Dead C, released in 1990 through Precious Metal. In 1998, The Wire included Trapdoor Fucking Exit
Trapdoor_Fucking_Exit
Family of spiders
The family Cyrtaucheniidae, known as wafer-lid trapdoor spiders, are a widespread family of mygalomorph spiders. Wafer-lid spiders are generally large
Wafer-lid_trapdoor_spider
Species of spider
Aptostichus angelinajolieae, also known as the Angelina Jolie trapdoor spider, is a species of Euctenizidae, nocturnal arthropods who seize their prey
Aptostichus_angelinajolieae
Firearm that holds one round of ammunition
50-70 cartridge, chambered in trapdoor conversions of rifled muskets that had been used in the American Civil War. The trapdoor mechanism continued usage
Single-shot
American author, journalist, and lecturer (born 1942)
his books Half the Way Home: A Memoir of Father and Son and Finding the Trapdoor: Essays, Portraits, Travels. He later was part of the movement against
Adam_Hochschild
Breech-loading rifle
The Springfield Model 1884 was one of the rifles which used the trapdoor breechblock design developed by Erskine S. Allin. It was an improved replacement
Springfield_model_1884
Clade of spiders
funnel-web spiders Barychelidae – brushed trapdoor spiders Bemmeridae Ctenizidae Cyrtaucheniidae – wafer trapdoor spiders Dipluridae – curtain-web spiders
Avicularioidea
Oldest recorded individual spider
Number 16 (c. 1974 – 2016), also known as #16, was a wild female trapdoor spider (Gaius villosus, family Idiopidae) that lived in North Bungulla Reserve
Number_16_(spider)
Breech-loading rifle
The Springfield Model 1870 was a trapdoor breechblock service rifle produced by the Springfield Armory for the United States military. Introduced in 1870
Springfield_model_1870
Quantum-safe key encapsulation mechanism
uses a variant of the learning with errors lattice problem as its basic trapdoor function. It won the NIST competition for the first post-quantum cryptography
ML-KEM
Species of spider found in Queensland, Australia
Euoplos dignitas is a species of armoured golden trapdoor spider in the family Idiopidae. It is found in Queensland, Australia. Specimens of Euoplos dignitas
Euoplos_dignitas
Species of spider
Aptostichus bonoi, or Bono's Joshua Tree trapdoor spider, is a morphological species of Euctenizidae spiders, nocturnal arthropods who seize their prey
Aptostichus_bonoi
American comedian, writer and television host (born 1964)
given scientific names honoring Colbert. In 2008 a species of California trapdoor spider was named Aptostichus stephencolberti. The spider was named for
Stephen_Colbert
Scheme often used with RSA encryption
plaintext prior to asymmetric encryption. When combined with any secure trapdoor one-way permutation f {\displaystyle f} , this processing is proved in
Optimal asymmetric encryption padding
Optimal_asymmetric_encryption_padding
Type of horse-drawn carriage
four-wheeled carriage, with two passenger seats back-to-back, and a tailgate-like trapdoor at the rear which supports the feet of the rear passengers. In the eighteenth
Trap_(carriage)
Species of spider
Eucteniza relata, the southwestern trapdoor spider, is a species of wafer-lid trapdoor spider in the family Euctenizidae. It is found in the United States
Eucteniza_relata
Species of spider
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
Migas_plomleyi
Structure for execution by hanging
hanging of British spy John André in 1780. Later, a "scaffold" with a trapdoor tended to be used, so victims dropped down and died quickly from a broken
Gallows
Species of spider
Bertmainius tingle, also called the tingle trapdoor spider, is a small basal spider endemic to the tingle and karri forest of southwestern Western Australia
Bertmainius_tingle
Black rugose trapdoor spider from 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
Idiosoma_nigrum
2012 video game
Warp is a video game developed by Trapdoor and published by Electronic Arts through its EA Partners program on Microsoft Windows, PlayStation 3 and Xbox
Warp_(2012_video_game)
lobera, Italian luparia, Portuguese fojo) was a chase ending in a pit with trapdoor and stakes used by beaters in hunting wolves in medieval Europe. Wolf hunting
Wolf_trap
Family of spiders
Migidae, also known as tree trapdoor spiders, is a family of spiders with about 100 species in eleven genera. They are small to large spiders with little
Migidae
Predator that hunts by surprise, as opposed to those that chase
price of a restricted field of vision. Trapdoor spiders excavate a burrow and seal the entrance with a web trapdoor hinged on one side with silk. The best-known
Ambush_predator
Species of spider
Arbanitis gracilis, also known as the silver-haired trapdoor spider, is a species of mygalomorph spider in the Idiopidae family. It is endemic to Australia
Arbanitis_gracilis
Genus of spiders
Cyclocosmia is a genus of mygalomorph trapdoor spiders in the family Halonoproctidae, first described by Anton Ausserer in 1871. Originally placed with
Cyclocosmia
Breech-loading rifle
Springfield Model 1869 was a cadet rifle version of the Springfield Model 1868 trapdoor breechblock service rifle. Made by the Springfield Armory, it featured
Springfield_Model_1869
2015 studio album by King Gizzard & the Lizard Wizard
Nonagon Infinity (2016) Singles from Paper Mâché Dream Balloon "Paper Mâché Dream Balloon" Released: 17 August 2015 "Trapdoor" Released: 21 September 2015
Paper_Mâché_Dream_Balloon
Genus of carnivorous plants
connected to the trapdoor. The bladder, when "set", is under negative pressure in relation to its environment so that when the trapdoor is mechanically
Utricularia
Breech-loading rifle
The Springfield Model 1880 was a trapdoor rifle based on the design of the Springfield Model 1873. In the years following the U.S. Civil War, Springfield
Springfield_model_1880
Species of spider
The Sydney brown trapdoor spider (Arbanitis rapax, synonym Misgolas rapax) is a spider in the family Idiopidae, found primarily around Sydney, Australia
Sydney_brown_trapdoor_spider
Species of spider
Blakistonia aurea, also known as the Adelaide trapdoor spider or the yellow trapdoor spider, is a species of mygalomorph spider in the Idiopidae family
Blakistonia_aurea
Species of gastropod
The Chinese mystery snail, black snail, or trapdoor snail (Margarya chinensis), is a large freshwater snail with gills and an operculum, an aquatic gastropod
Margarya_chinensis
reported Geurts struggling for several minutes after falling through the trapdoor. James Stephens (1860) – Hanging by upright jerker. He contorted and gurgled
List_of_botched_executions
Genus of spiders
of armored trapdoor spiders that was first described by Josef Anton Maximilian Perty in 1833. It is the type genus of the spurred trapdoor spiders, Idiopidae
Idiops
Mathematical scheme for verifying the authenticity of digital documents
only conjectured that such schemes existed based on functions that are trapdoor one-way permutations. Soon afterwards, Ronald Rivest, Adi Shamir, and Len
Digital_signature
Breech-loading rifle
The Springfield Model 1882 was a trapdoor short rifle based on the design of the Springfield Model 1873. It is usually referred to as a short rifle but
Springfield_Model_1882
Species of spider
Fagilde's trapdoor spider (Nemesia berlandi) or buraqueira-de-Fagilde in Portuguese, is a trapdoor spider of the family Nemesiidae, currently only known
Nemesia_berlandi
American singer (1943–1997)
Service Medal, 1985 Albert Schweitzer Music Award, 1993 John Denver's Trapdoor Spider (Cyclocosmia johndenveri Sherwood, Warhol & Bianco, 2025) was described
John_Denver
Family of spiders
(folding trapdoor spiders) Atracidae (Australian funnel-web spiders) Atypidae (atypical tarantulas or purseweb spiders) Barychelidae (brushed trapdoor spiders)
Pholcidae
Species of spider
It is endemic to South Africa and is commonly known as Gunning's Idiops trapdoor spider. Idiops gunningi is recorded from two provinces in South Africa
Idiops_gunningi
Trap Door is a science-fiction fanzine published by Robert Lichtman, with the first issue appearing in October 1983 and last in 2018. It received nominations
Trap_Door_(magazine)
Species of spider
in the exotic pet trade due to their bright colors and unique arboreal trapdoor builds. These spiders live in the humid rainforest of northeastern Brazil
Typhochlaena_seladonia
Practice and study of secure communication techniques
cryptography Hash-based cryptography Non-commutative cryptography RSA problem Trapdoor function Tropical cryptography Standardization CRYPTREC IEEE P1363 NESSIE
Cryptography
Family of spiders
(folding trapdoor spiders) Atracidae (Australian funnel-web spiders) Atypidae (atypical tarantulas or purseweb spiders) Barychelidae (brushed trapdoor spiders)
Wolf_spider
spider Family Barychelidae Idioctis spp., Intertidal trapdoor spider Idiommata spp., Brushfooted trapdoor spider Seqocrypta jakara, Brush footed spider Family
List of common spider species of Australia
List_of_common_spider_species_of_Australia
Public-key encryption scheme
based on a trapdoor function whose security, like that of RSA, is related to the difficulty of integer factorization. The Rabin trapdoor function has
Rabin_cryptosystem
Family of spiders
(folding trapdoor spiders) Atracidae (Australian funnel-web spiders) Atypidae (atypical tarantulas or purseweb spiders) Barychelidae (brushed trapdoor spiders)
Orb-weaver_spider
Canadian and American musician (born 1945)
Bond, an East Carolina University biologist, discovered a new species of trapdoor spider in 2007 and named it Myrmekiaphila neilyoungi after Young, his favorite
Neil_Young
Species of spider
Aptostichus atomarius, the San Bernardino hills trapdoor spider, is a species of wafer-lid trapdoor spider in the family Euctenizidae. It is found in
Aptostichus_atomarius
Type of animal behavior
they are hiding. Trapdoor: Trapdoor spiders construct burrows with a cork-like trapdoor made of soil, vegetation and silk. The trapdoor is difficult to
Spider_behavior
Order of arachnids
Liphistiidae, the "trapdoor spiders" of the family Ctenizidae and many tarantulas are ambush predators that lurk in burrows, often closed by trapdoors and often
Spider
1896 French film
Buatier de Kolta, in which a woman disappeared by escaping through a hidden trapdoor. However, using an editing technique known as the substitution splice,
The_Vanishing_Lady
Genus of spiders
Sinacosa is a genus of trapdoor-building wolf spiders in the family Lycosidae. It is the first trapdoor-building wolf spider reported from outside Australia
Sinacosa
hard-core bit by each round n. Hard-core predicates of trapdoor one-way permutations (known as trapdoor predicates) can be used to construct semantically secure
Hard-core_predicate
2025 film directed by Emma Tammi
daughter. Charlotte is fatally stabbed by William, falls through an onstage trapdoor, and is held by the Marionette animatronic. The incident is suppressed
Five Nights at Freddy's 2 (film)
Five_Nights_at_Freddy's_2_(film)
Family of spiders
(folding trapdoor spiders) Atracidae (Australian funnel-web spiders) Atypidae (atypical tarantulas or purseweb spiders) Barychelidae (brushed trapdoor spiders)
Jumping_spider
Species of trapdoor spider
Titanidiops canariensis is a species of trapdoor spiders belonging belonging to the family Idiopidae (armored trapdoor spiders). They live on the archipelago
Titanidiops_canariensis
2010 novel by David Michie
and ancient Buddhist practices. The novel is published by Trapdoor Books, an imprint of Trapdoor Publishing. "The Book the Chinese Government Doesn't Want
The_Magician_of_Lhasa
Family of spiders
can be confused with other members of the order Mygalomorphae, such as trapdoor spiders, funnel-web spiders and purseweb spiders. They can also be confused
Tarantula
Room or cell for keeping prisoners
to the prison and the oubliette (the latter a cell only accessible by a trapdoor in its ceiling), and the words are sometimes used interchangeably. In the
Dungeon
Genus of spiders
Gorgyrella is a genus of African armored trapdoor spiders that was first described by William Frederick Purcell in 1902. According to Purcell in 1903,
Gorgyrella
Rifle cartridge
black powder cartridge adopted in 1866 for the Springfield Model 1866 trapdoor rifle. Derived from the .50-60-400 Joslyn, the cartridge was developed
.50-70_Government
Suborder of spiders
Elements Resolves the Evolutionary and Biogeographic History of Segmented Trapdoor Spiders". Systematic Biology. 70 (6): 1110–1122. doi:10.1093/sysbio/syaa098
Mesothelae
Species of spider
Jason E. (2021-04-02). "Taxonomic revision of the New World members of the trapdoor spider genus Ummidia Thorell (Araneae, Mygalomorphae, Halonoproctidae)"
Ummidia_richmond
Species of spider
Euoplos regalis, also known as the regal trapdoor spider or the regal golden trapdoor spider, is a species of mygalomorph spider in the Idiopidae family
Euoplos_regalis
Single-shot rifle
artillery & short rifles). In February 1866, General Hiram Berdan patented a trapdoor mechanism for firearms and a Berdan-type gun was submitted to the United
Berdan_rifle
Genus of spiders
Cyrtocarenum is a genus of Balkan trapdoor spiders first described by Anton Ausserer in 1871. As of October 2025[update], this genus includes three species:
Cyrtocarenum
Superfamily of arachnids
different types of burrow entrance constructs, including purse webs, trapdoors, funnel-and-sheet webs, turrets and silken collars. The following cladogram
Atypoidea
Species of spider
Idioctis yerlata, also known as the intertidal trapdoor spider, is a species of mygalomorph spider in the Barychelidae family. It is endemic to Australia
Idioctis_yerlata
Species of spider
Gaius villosus is a species of spider in the family Idiopidae (armored trapdoor spiders) found in Western Australia in a variety of different habitats
Gaius_villosus
Feature of gastropod anatomy
or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails
Operculum_(gastropod)
Species of trapdoor spider
Liphistius buran is a species of trapdoor spider that is native only to Pangkor island, Malaysia. They are found on sloping earth banks along old logging
Liphistius_buran
American con artist and serial killer (1861–1896)
"Murder Castle", claiming the structure contained secret torture chambers, trapdoors, gas chambers and a basement crematorium; none of these sensationalised
H._H._Holmes
Cryptographic algorithm for digital signatures
cryptography Hash-based cryptography Non-commutative cryptography RSA problem Trapdoor function Tropical cryptography Standardization CRYPTREC IEEE P1363 NESSIE
Elliptic Curve Digital Signature Algorithm
Elliptic_Curve_Digital_Signature_Algorithm
TRAPDOOR
TRAPDOOR
TRAPDOOR
TRAPDOOR
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Mist; Fog; Dew Drop; Goddess Name; Smile
Boy/Male
Indian
Brother of Krishna.
Surname or Lastname
English
English : habitational name from a place in Norfolk, so called from the Old Norse personal name Fili or Fila (of uncertain origin) + Old Norse býr ‘farm’, ‘settlement’.
Girl/Female
Indian
Elf friend, Highest, Height
Boy/Male
Tamil
Girl/Female
Tamil
Innocent lamb
Boy/Male
Hindu, Indian
Blue
Girl/Female
Australian, German, Greek, Norse, Scandinavian, Swedish
Shield-bearer; God; Thor's Struggle; Warrior
Boy/Male
British, English, Welsh
Bright; White Sea Dweller; Great and Bright
Boy/Male
Muslim/Islamic
It was the name of the Tabiee Abu Salih
TRAPDOOR
TRAPDOOR
TRAPDOOR
TRAPDOOR
TRAPDOOR
n.
A door in a level for regulating the ventilating current; -- called also weather door.
n.
A genus of very large hairy spiders having four lungs and only four spinnerets. They do not spin webs, but usually construct tubes in the earth, which are often furnished with a trapdoor. The South American bird spider (Mygale avicularia), and the crab spider, or matoutou (M. cancerides) are among the largest species. Some of the species are erroneously called tarantulas, as the Texas tarantula (M. Hentzii).
n.
A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry.
n.
A boy who opens and shuts a trapdoor in a gallery or level.
n.
A lifting or sliding door covering an opening in a roof or floor.
n. pl.
A division of Arachnida including those spiders which have four lungs, or pulmonary sacs. It includes the bird spiders (Mygale) and the trapdoor spiders. See Mygale.