[rey-dee-oh-ak-tiv] /ˌreɪ di oʊˈæk tɪv/

adjective, Physics, Chemistry.
of, pertaining to, exhibiting, or caused by .
exhibiting, using, or concerned with radioactivity

1898, from French radio-actif, coined by Pierre and Marie Curie from radio-, comb. form of Latin radius (see radiation) + actif “active” (see active).

radioactive ra·di·o·ac·tive (rā’dē-ō-āk’tĭv)
Of or exhibiting radioactivity.

A descriptive term for a material made up of atoms in which radioactivity occurs.


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