trap·door

[trap-dawr, -dohr]
noun
1.
a door flush with the surface of a floor, ceiling, or roof.
2.
the opening that it covers.
adjective
3.
of, pertaining to, or like a trapdoor.

Origin:
1325–75; Middle English trappe dore. See trap1, door

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Trapdoor is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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Example sentences
Above the second-floor landing was a locked rectangular trapdoor, painted brown
  and scored with scratches.
Ferrets have been observed returning to the cages for no more than a few days
  after the trapdoor was opened.
He stood beneath the trapdoor and pulled a kitchen chair into the hallway and
  stood on it.
When an aquatic bug brushes one of the trigger hairs, the plant pumps out
  creating a vacuum and the trapdoor swings open.
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