Thesaurus.com
Dictionary.com
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.

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

If it works, it could provide potentially limitless electricity without greenhouse gases or long-lived radioactive waste.

From The Wall Street Journal • May 1, 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

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

Although they did not know it then, the steel reactor vessel had been breached, and the radioactive fuel was oozing into the drywell, the open space in the primary containment chamber.

From "Meltdown" by Deirdre Langeland



Vocabulary lists containing radioactive


Vocabulary.com logo
by dictionary.com

Look it up. Learn it forever.

Remember "radioactive" for good with VocabTrainer. Expand your vocabulary effortlessly with personalized learning tools that adapt to your goals.

Take me to Vocabulary.com