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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 rad /ˈræd/

From: Webster's Revised Unabridged Dictionary (1913)

 Rad obs. imp. & p. p. of Read, Rede.

From: WordNet (r) 2.0

      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]