Radioactive Definition

rādē-ō-ăktĭv
adjective
Giving off, or capable of giving off, radiant energy in the form of particles or rays, as alpha, beta, and gamma rays, by the spontaneous disintegration of atomic nuclei.
Webster's New World
Of, exhibiting, or caused by radioactivity.
American Heritage
Extremely sensitive or controversial.
American Heritage
Antonyms:

Origin of Radioactive

  • Adaptation of French radioactif, from radio- +"Ž active.

    From Wiktionary

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radioactive