#crosspiece  a transverse brace
  supertype:  #bracing__brace  a structural member used to stiffen a framework
  subtype:  #crossbar  long thin horizontal crosspiece between two vertical posts
  subtype:  #rundle__spoke  one of the crosspieces that form the steps of a ladder
  subtype:  #rung__round__stave  a crosspiece between the legs of a chair
  subtype:  #cross_thwart__crossthwart__thwart  a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat
  subtype:  #transom__traverse  a horizontal crosspiece across a window or separating a door from a window over it

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