01 n. A lifting or sliding door covering an opening in a roof or floor.
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1.
A lifting or sliding door covering an opening in a roof or floor.(Arch.)
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2.
A door in a level for regulating the ventilating current; -- called also weather door.(Mining) Also: weather door
Phrases & compounds
Trapdoor spider —
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).