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radioactivity |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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. From WordNet r 1.6 [wn]: radioactivity n : radiation resulting from radioactive decay [syn: {activity}]
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