Radioactive
[rey-dee-oh-ak-tiv] /ˌreɪ di oʊˈæk tɪv/
adjective, Physics, Chemistry.
1.
of, pertaining to, exhibiting, or caused by .
/ˌreɪdɪəʊˈæktɪv/
adjective
1.
exhibiting, using, or concerned with radioactivity
adj.
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)
adj.
Of or exhibiting radioactivity.
A descriptive term for a material made up of atoms in which radioactivity occurs.
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