Radioactive

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  radioactive \ra`di*o*ac"tive\ (r[=a]`d[i^]*[-o]*[a^]k"t[i^]v),
     a. [Radio- + active.]
     1. (Physics) Capable of luminescence under the action of
        cathode rays, X rays, or any of the allied forms of
        radiation. [obsolete]
        [Webster 1913 Suppl.]


  
     2. (Physics) of, exhibiting, or caused by {radioactivity}.
        [PJC]

From WordNet (r) 2.0 [wn]:

  radioactive
       adj : exhibiting or caused by radioactivity; "radioactive
             isotope"; "radioactive decay"; "radioactive fallout"
             [ant: {nonradioactive}]