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Radio-active

Source : Webster's Revised Unabridged Dictionary (1913)

Radio-active \Ra`di*o-ac"tive\, a. [Radio- + active.] (Physics)
   Capable of luminescence under the action of cathode rays, X
   rays, or any of the allied forms of radiation. --
   {Ra`di*o-ac*tiv"i*ty}, n.
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