GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       
Rad (răd), n. [radiation absorbed dose.] A unit of measurement of the amount of ionizing radiation absorbed by an object, equal to an energy of 100 ergs per gram of irradiated material (equal to 0.01 gray).

    [PJC]

    
      
    
  2.       
Rad (răd), obs. imp. & p. p. of Read, Rede.  Spenser.

    [1913 Webster]

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