: a heavy radioactive gaseous element formed by the decay of radium see Chemical Elements Table
Examples of radon in a Sentence
Recent Examples on the Web
While there is no safe level of radon, the risk from radon is largely preventable and winter is the best time to test for it.
—
Mars King, Twin Cities, 17 Jan. 2026
They are also designed to release the buildup of dangerous gases like radon.
—Brandee Gruener, Southern Living, 16 Jan. 2026
January is Radon Action Month, and the Cook County Department of Public Health is urging residents to test their homes for radon.
—Adam Harrington, CBS News, 11 Jan. 2026
Additionally, because exposure to radon gas and asbestos are risk factors for lung cancer, the CDC recommends getting your home tested for radon and taking measures to reduce occupational exposures to carcinogens like asbestos.
—Alyssa Goldberg, USA Today, 23 Dec. 2025
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Mars King, Twin Cities, 17 Jan. 2026
They are also designed to release the buildup of dangerous gases like radon.
—Brandee Gruener, Southern Living, 16 Jan. 2026
January is Radon Action Month, and the Cook County Department of Public Health is urging residents to test their homes for radon.
—Adam Harrington, CBS News, 11 Jan. 2026
Additionally, because exposure to radon gas and asbestos are risk factors for lung cancer, the CDC recommends getting your home tested for radon and taking measures to reduce occupational exposures to carcinogens like asbestos.
—Alyssa Goldberg, USA Today, 23 Dec. 2025
See All Example Sentences for radon
Cite this Entry
“Radon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radon. Accessed 23 Jan. 2026.
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Medical Definition
radon
noun
ra·don
ˈrā-dän 
: a heavy radioactive gaseous element of the group of inert gases formed by disintegration of radium and used similarly to radium in medicine
—symbol Rn
called also radium emanation
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