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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.

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

From Science Daily • Apr. 14, 2026

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

If there really was a fire in one of the storage pools, there was nothing to hold in radioactive materials, which would be carried in the smoke.

From "Meltdown" by Deirdre Langeland



Vocabulary lists containing radioactive