[1] : The Collaborative International Dictionary of English v.0.48

trapdoor \trap"door`\, n.
   1. arch. a lifting or sliding door covering an opening in a
      roof or floor.
      1913 webster

   2. mining a door in a level for regulating the ventilating
      current; -- called also weather door. --raymond.
      1913 webster

   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.
      1913 webster
see also:
weather door trapdoor spider cteniza cteniza californica 

Trapdoor >> T Words
Trapdoor, definition of term: Trapdoor
trapdoor_pag1.html