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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.

Watch Allison Macfarlane, former chairman of the Nuclear Regulatory Commission, break down why the country fell behind—and what it will take to finally build a long-term home for these radioactive materials.

From The Wall Street Journal • Jun. 24, 2026

Overuse of today’s AI models isn’t going to lead to a massive plume of radioactive fallout, but it could have a number of far-reaching consequences that will seem obvious in retrospect.

From The Wall Street Journal • Jun. 21, 2026

Tuttle has spoken frankly about his film’s somewhat radioactive reception.

From Salon • Jun. 15, 2026

The main long-term risks are corrosion of the copper canisters or earthquakes during future ice ages, which could potentially damage the capsules and cause radioactive fuel to leak, Kyllonen said.

From Barron's • Jun. 1, 2026

In the 1980s, the KGB had begun marking suspected foreign agents with an invisible radioactive dust that could be picked up with radiation sensors.

From "Spies: The Secret Showdown Between America and Russia" by Marc Favreau



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