'radioactive' definitions:
Definition of 'radioactive'
From: WordNet
adjective
Exhibiting or caused by radioactivity; "radioactive isotope"; "radioactive decay"; "radioactive fallout" [ant: nonradioactive]
Definition of 'radioactive'
From: 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]