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Definitions

radioactive

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


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

He was the first to have shape-shifting powers, which he gained after encountering a mysterious radioactive pool of protoplasm.

From Los Angeles Times • Apr. 22, 2026

The licence was issued as environmental watchdogs such as Greenpeace raised concerns over the management of radioactive by-products.

From Barron's • Apr. 22, 2026

Forty years later, the highly radioactive remains of the plant are in a warzone.

From BBC • Apr. 18, 2026

In these reactions, atomic nuclei repeatedly absorb neutrons and then undergo radioactive decay until they reach stable forms.

From Science Daily • Apr. 14, 2026

The suit’s function is to prevent radioactive dust from hitching a ride on the wearer’s body—in their hair or clothes, on their skin, or in their lungs.

From "Meltdown" by Deirdre Langeland



Vocabulary lists containing radioactive