#arcdegree__degree  a measure for arcs and angles; "there are 360 degrees in a circle"
  supertype:  #angular_unit__angularunit  a unit of measurement for angles
  part:  #minute_of_arc
  part of:  #oxtant  a unit of angular distance equal to half a quadrant
     part of:  #quadrant.angular_unit__right_angle__rightangle  a quarter of the circumference of a circle
        part of:  #straight_angle  an angle of 180 degrees
           part of:  #circumference  the length of the closed curve of a circle
  part of:  #sextant.angular_unit  a unit of angular distance equal to 60 degrees
     part of:  #circumference  the length of the closed curve of a circle

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