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trapdoor
A trapdoor is a sliding or hinged door, flush with the surface of a floor, roof, or ceiling, or in the stage of a theatre.〔Oxford English Dictionary 2nd ed.〕 A hatch, an opening which may also be in a wall and need not be flush with the surface, is similar; in some cases either name is applicable. A small door in a wall, floor or ceiling used to gain access to equipment is called an access hatch or access door.
==History==
Originally, trapdoors were sack traps in mills, and allowed the sacks to pass up through the mill while naturally falling back to a closed position.
Many buildings with flat roofs have hatches that provide access to the roof; on ships, hatches—usually not flush, and never called trapdoors—provide access to the deck. Cargo ships, including bulk carriers, have large hatches for access to the holds.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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