Wordnet 3.0
ADJECTIVE (1)
1.
exhibiting or caused by radioactivity;
- Example: "radioactive isotope"- Example: "radioactive decay"- Example: "radioactive fallout"
The Collaborative International Dictionary of English v.0.48:
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]
WordNet (r) 3.0 (2006):
radioactive
adj 1: exhibiting or caused by radioactivity; "radioactive
isotope"; "radioactive decay"; "radioactive fallout"
[ant: nonradioactive]