radioactivity : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: radioactivity	by the DICT Development Group
2 results for radioactivity
From WordNet (r) 3.0 (2006) [wn]:
radioactivity n the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay Synonym(s): radiation, radioactivity
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Radio-active \Ra`dio-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`dio-activ"ity}, n.