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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]