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Definition of Radioactive
1. Adjective. Exhibiting or caused by radioactivity. "Radioactive fallout"
Definition of Radioactive
1. a. Capable of luminescence under the action of cathode rays, X rays, or any of the allied forms of radiation.
Definition of Radioactive
1. [adj]
Medical Definition of Radioactive
1. Giving off radiation. (12 Dec 1998)