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Meaning of RADIO-ACTIVE

Webster's 1913 Dictionary
 
 Definition: 
\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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