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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.

Scientists have found that using a radioactive implant precisely where a tumor was removed in the brain can help patients get their cancer treated more quickly and in many cases, live longer.

From The Wall Street Journal • May 30, 2026

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

According to the team, the results strongly point to the Local Interstellar Cloud as the source of the radioactive material.

From Science Daily • May 14, 2026

Rather than wait, the Japanese government undertook a massive clean up, digging up radioactive soil from contaminated towns and hauling it away.

From "Meltdown" by Deirdre Langeland



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