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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.

Monazite tends to contain higher levels of radioactive thorium, which can be a processing issue.

From Barron's • May 18, 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

By studying Antarctic ice that formed tens of thousands of years ago, researchers detected traces of iron-60, a rare radioactive form of iron created during supernova explosions.

From Science Daily • May 14, 2026

Instead, the deal allowed Iran’s scientists and technicians to continue gaining experience with nuclear technology and the handling of materials that aren’t only radioactive but also highly toxic and corrosive.

From The Wall Street Journal • Apr. 27, 2026

Closer to the reactor buildings, a thousand water storage tanks holding more than 250,000 gallons of radioactive water crowded the grounds.

From "Meltdown" by Deirdre Langeland



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