#diameter__diam  the length of a straight line passing through the center of a circle and connecting two points on the circumference
  exclusion:  #width  #height  #length  #circumference  #surface_area  #volume  #thickness  #tenuity  #angle
  supertype:  menu#spatial_characteristic (menu)  #length.distance
  subtype:  #bore  #windage
  part:  #radius__r  the length of a line segment between the center and circumference of a circle or sphere

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