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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.

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

He was the first to have shape-shifting powers, which he gained after encountering a mysterious radioactive pool of protoplasm.

From Los Angeles Times • Apr. 22, 2026

The licence was issued as environmental watchdogs such as Greenpeace raised concerns over the management of radioactive by-products.

From Barron's • Apr. 22, 2026

Drawing on his training, he took some fabric, wet it and put it across the apartment entrance as a precaution to catch radioactive dust, he adds.

From BBC • Apr. 18, 2026

But they are still highly radioactive, loaded with radioactive isotopes, the by-products of fission.

From "Meltdown" by Deirdre Langeland



Vocabulary lists containing radioactive