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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 this study, researchers successfully recreated a key step in the process by observing proton capture on radioactive arsenic-73 for the first time.

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 nuclear start-up announced that it had secured its first license from the Nuclear Regulatory Commission, a federal agency that oversees the civilian use of radioactive materials.

From Barron's • Mar. 17, 2026

But the reactor buildings were filled with water and radioactive debris.

From "Meltdown" by Deirdre Langeland



Vocabulary lists containing radioactive