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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.

To avoid creating and managing radioactive waste, TAE wants to use a fuel that requires far hotter plasmas than other fusion companies aim for, posing a bigger physics challenge.

From The Wall Street Journal • Mar. 28, 2026

But then, he predicted that industries would start using uranium and radium, and pretty soon we’d have … radioactive smog.

From Los Angeles Times • Mar. 26, 2026

The license specifically applies to Atomic Alchemy, a wholly-owned subsidiary dealing in the production of radioactive isotopes.

From Barron's • Mar. 18, 2026

Herrera was certainly the less radioactive candidate of the two.

From Slate • Mar. 9, 2026

And in the early hours of Tuesday morning, the favorable winds that had been sweeping the radioactive gases out to sea had shifted, carrying radioactive cesium inland.

From "Meltdown" by Deirdre Langeland