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trapdoor.

A hinged or sliding door set into a floor or ceiling.

8 characters2 syllables approx.English language

Meaning & usage

noun/ˈtræpdɔː/Received-Pronunciation/ˈtræpdoɹ/General-American
  1. A hinged or sliding door set into a floor or ceiling.

  2. Such a trap set into the floor of a stage to allow fast exits and entrances.

  3. A secret method of obtaining access to a program or online system; a backdoor.

  4. The special information that permits the inverse of a trapdoor function to be easily computed.

  5. A door in a level for regulating the ventilating current; a weather door.

Where this word comes from

From trap + door.

verb/ˈtræpdɔː/Received-Pronunciation/ˈtræpdoɹ/General-American
  1. To subvert (a cryptographic scheme) by means of a secret parameter that makes the trapdoor function easy to compute.

    transitive
  2. To form a trapdoor deformity.

    intransitive
Where this word comes from

From trap + door.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.