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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

Through all of this, the film remains focused on human experience, rendered with something approaching optimism despite the radioactive gloom that surrounds it.

From The Wall Street Journal • Mar. 26, 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

Iodine 131 is a particularly problematic radioactive isotope because it tends to drift for long distances on the wind.

From "Meltdown" by Deirdre Langeland



Vocabulary lists containing radioactive