#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
  part:  #radius
  subtype:  #bore__caliber__calibre  diameter of a tube or gun barrel
  subtype:  #windage  bore-to-projectile difference in diameter

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