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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.

The Swiss drugmaker released data from an early-stage clinical trial for its 225Ac-PSMA-617 drug candidate that showed so-called alpha particle radioactive isotopes should work in fighting prostate cancer, the analyst says.

From The Wall Street Journal • Jun. 2, 2026

The doors slide open, revealing the entrance to what is expected to be the world's first permanent repository for radioactive spent nuclear fuel.

From Barron's • Jun. 1, 2026

The director-general of the IAEA, Rafael Grossi, has warned repeatedly about the risk of a radioactive incident at such plants.

From Salon • May 21, 2026

“The dangers are so much different. Instead of an explosion, it just turns off. There’s no radioactive waste. So this light touch is exactly what the Congress overwhelmingly … wanted the NRC to do.”

From MarketWatch • May 18, 2026

If left alone, the groundwater would continue to flow toward the sea, carrying radioactive isotopes from the reactors with it, so workers pumped hundreds of gallons of water from the reactor basements every day.

From "Meltdown" by Deirdre Langeland



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