: 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 that’s the most common environmental issue, alarm bells should sound if your inspector turns up asbestos or radon as well.
—
Berit Thorkelson, Better Homes & Gardens, 1 Apr. 2025
Besides an examination of the house, there may be other inspections required — perhaps for radon or termites.
—Lew Sichelman, Miami Herald, 6 Mar. 2025
The process includes testing properties for substances like lead, mold, radon and asbestos.
—Celia Fernandez,tasia Jensen, CNBC, 4 Mar. 2025
Other risks are a family history of lung cancer or radon exposure.
—Cindy Krischer Goodman, Sun Sentinel, 25 Nov. 2024
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Berit Thorkelson, Better Homes & Gardens, 1 Apr. 2025
Besides an examination of the house, there may be other inspections required — perhaps for radon or termites.
—Lew Sichelman, Miami Herald, 6 Mar. 2025
The process includes testing properties for substances like lead, mold, radon and asbestos.
—Celia Fernandez,tasia Jensen, CNBC, 4 Mar. 2025
Other risks are a family history of lung cancer or radon exposure.
—Cindy Krischer Goodman, Sun Sentinel, 25 Nov. 2024
See All Example Sentences for radon
Cite this Entry
“Radon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radon. Accessed 16 Apr. 2025.
Copy CitationKids Definition
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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