radioelement

[rey-dee-oh-el-uh-muhnt]
noun Chemistry.
a radioactive element.

Origin:
1900–05; radio- + element

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World English Dictionary
radioelement (ˌreɪdɪəʊˈɛlɪmənt)
 
n
an element that is naturally radioactive

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Radioelement maps for each pilot area helped guide sample collection and design.
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