Definify.com
Webster 1913 Edition
Trapdoor
Trap′doorˊ
,Noun.
1.
(Arch.)
A lifting or sliding door covering an opening in a roof or floor.
2.
(Mining)
A door in a level for regulating the ventilating current; – called also
weather door
. Raymond.
Trapdoor spider
(Zool.)
, 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
).