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 for Trapdoor spider
From 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
        [1913 Webster]

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