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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.

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

Forty years later, the highly radioactive remains of the plant are in a warzone.

From BBC • Apr. 18, 2026

In this study, researchers successfully recreated a key step in the process by observing proton capture on radioactive arsenic-73 for the first time.

From Science Daily • Apr. 14, 2026

Fusion, the reaction that powers the sun, has long been considered the ultimate clean-energy prize: potentially limitless electricity without greenhouse gases or radioactive waste.

From The Wall Street Journal • Mar. 28, 2026

The suit’s function is to prevent radioactive dust from hitching a ride on the wearer’s body—in their hair or clothes, on their skin, or in their lungs.

From "Meltdown" by Deirdre Langeland



Vocabulary lists containing radioactive