: 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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Another important pre-move-in step is to make sure all of the detectors — smoke, carbon monoxide and radon — are operational.
—
Lew Sichelman, Miami Herald, 23 July 2024
Do it every two years, says the state of Michigan's radon advisory because a home's foundation can shift to allow more radon to enter or an initial test may be inaccurate.
—Bill Laytner, Detroit Free Press, 6 Feb. 2024
Thawing Arctic permafrost will expose local populations to more radon, and the iodine of desert dust may decrease ozone pollution but increase greenhouse gas longevity.
—Alexander Sammon, Harper's Magazine, 25 June 2022
But the amount of radon in each home varies widely.
—Andy Larsen, The Salt Lake Tribune, 22 July 2023
See all Example Sentences for radon 
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Lew Sichelman, Miami Herald, 23 July 2024
Do it every two years, says the state of Michigan's radon advisory because a home's foundation can shift to allow more radon to enter or an initial test may be inaccurate.
—Bill Laytner, Detroit Free Press, 6 Feb. 2024
Thawing Arctic permafrost will expose local populations to more radon, and the iodine of desert dust may decrease ozone pollution but increase greenhouse gas longevity.
—Alexander Sammon, Harper's Magazine, 25 June 2022
But the amount of radon in each home varies widely.
—Andy Larsen, The Salt Lake Tribune, 22 July 2023
See all Example Sentences for radon
Dictionary Entries Near radon
Cite this Entry
“Radon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radon. Accessed 8 Nov. 2024.
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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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