: 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
First, there is no building in the United States without some radon.
—
Nick Rosenberger, Idaho Statesman, 22 Apr. 2025
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
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Nick Rosenberger, Idaho Statesman, 22 Apr. 2025
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
See All Example Sentences for radon
Cite this Entry
“Radon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radon. Accessed 1 May. 2025.
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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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