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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.

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

Amundsen’s work is in keeping with the rest of the show, which fills two halls at the liberal arts school with visual and multimedia works that probe the persistence of radioactive materials.

From Los Angeles Times • Mar. 27, 2026

The U.S. military has elite teams specially trained to remove radioactive material from a conflict zone.

From The Wall Street Journal • Mar. 15, 2026

Herrera was certainly the less radioactive candidate of the two.

From Slate • Mar. 9, 2026

But if a radioactive particle or wave has enough energy, it can knock electrons out of an atom altogether, creating an ion.

From "Meltdown" by Deirdre Langeland



Vocabulary lists containing radioactive