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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 highly radioactive material is held at several secure sites across the country, including at LANL.

From Barron's • May 26, 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

“For real. He got bit by a radioactive spider. You ate jelly beans. You both ended up with superpowers.”

From "The Smartest Kid in the Universe" by Chris Grabenstein



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