: a heavy radioactive gaseous element formed by the decay of radium see Chemical Elements Table
Examples of radon in a Sentence
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Or just smarter smoke alarms and radon detectors that also check for dozens of different contaminants.
—
John Koetsier, Forbes.com, 8 Sep. 2025
And who has the responsibility to get rid of the radon?
—Jill Terreri Ramos, New York Times, 26 Apr. 2025
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
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John Koetsier, Forbes.com, 8 Sep. 2025
And who has the responsibility to get rid of the radon?
—Jill Terreri Ramos, New York Times, 26 Apr. 2025
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
See All Example Sentences for radon
Cite this Entry
“Radon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radon. Accessed 15 Sep. 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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