: 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
Testing over several months provides a better understanding of the average annual radon level in the home.
—
Jan Lowery, The Conversation, 20 Feb. 2026
Those funds will be used for county-wide home improvement loans and radon mitigation grants, Swenson said.
—Mars King, Twin Cities, 8 Feb. 2026
At the time, just one 1990 study had linked radon to leukemia in Great Britain.
—Max Filby, Cincinnati Enquirer, 20 Nov. 2025
And who has the responsibility to get rid of the radon?
—Jill Terreri Ramos, New York Times, 26 Apr. 2025
See All Example Sentences for radon
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Jan Lowery, The Conversation, 20 Feb. 2026
Those funds will be used for county-wide home improvement loans and radon mitigation grants, Swenson said.
—Mars King, Twin Cities, 8 Feb. 2026
At the time, just one 1990 study had linked radon to leukemia in Great Britain.
—Max Filby, Cincinnati Enquirer, 20 Nov. 2025
And who has the responsibility to get rid of the radon?
—Jill Terreri Ramos, New York Times, 26 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 4 Mar. 2026.
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
see Chemical Elements TableLove words? Need even more definitions?
Merriam-Webster unabridged
