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1 definition found
 for rad
From WordNet (r) 3.0 (2006) :

  rad
      n 1: a unit of absorbed ionizing radiation equal to 100 ergs per
           gram of irradiated material
      2: the unit of plane angle adopted under the Systeme
         International d'Unites; equal to the angle at the center of a
         circle subtended by an arc equal in length to the radius
         (approximately 57.295 degrees) [syn: radian, rad]

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