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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

Lynas however, says its by-product from rare earth refining produces a non-toxic, non-radioactive magnesium-rich gypsum and an iron phosphate with a very low level of naturally occurring radioactive material.

From Barron's • Apr. 22, 2026

Reactor number four at the Chernobyl power plant – in what is now northern Ukraine - had exploded, spewing out radioactive material that would spread across swathes of Europe.

From BBC • Apr. 18, 2026

The radioactive element used in the core was solinium 2, which had a half-life of fourteen seconds.

From "Artemis Fowl" by Eoin Colfer



Vocabulary lists containing radioactive