#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:  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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