#doorsill__doorstep__threshold  the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offer support when passing through a doorway
  supertype:  #sill  structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
  part of:  #doorway__door__room_access__threshold  the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close; "he stuck his head in the doorway"
     part of:  #wall  an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure; "the south wall had a small window"; "the walls were covered with pictures"
        part of:  #edifice__building  a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"
        part of:  #hallway__hall  an interior passage or corridor onto which rooms open; "the elevators were at the end of the hall"
        part of:  #room  an area within a building enclosed by walls and floor and ceiling; "the rooms were very small but they had a nice view"
           part of:  #edifice__building  a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"

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