#extreme_point__extremepoint__extreme__extremum  the point located farthest from the middle of something
  supertype:  extremity.region  the outermost or farthest region or point
  subtype:  apex__vertex__peak__acme  the highest point of something
     subtype:  crown  the part of a hat (the vertex) covering the crown of the head
     subtype:  roof_peak  the highest point of a roof

No statement uses or specializes extreme_point; click here to add one.