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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.

The nonrenewable gas is produced by radioactive decay deep under the earth and escapes into space once released.

From The Wall Street Journal • Mar. 31, 2026

But then, he predicted that industries would start using uranium and radium, and pretty soon we’d have … radioactive smog.

From Los Angeles Times • Mar. 26, 2026

Herrera was certainly the less radioactive candidate of the two.

From Slate • Mar. 9, 2026

In the end, Fennell took home the statue for best original screenplay, cementing her prowess in Oscar gold — and turning herself radioactive forevermore.

From Salon • Feb. 23, 2026

The new basement shelter had a four-inch-thick door, Army cots and canned food, a direct phone line to the Pentagon’s bomb shelter, and a shower to wash off radioactive fallout.

From "Fallout: Spies, Superbombs, and the Ultimate Cold War Showdown" by Steve Sheinkin