: 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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Additionally, because exposure to radon gas and asbestos are risk factors for lung cancer, the CDC recommends getting your home tested for radon and taking measures to reduce occupational exposures to carcinogens like asbestos.
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Alyssa Goldberg, USA Today, 23 Dec. 2025
Have your home checked for radon and mold.
—Helen Carefoot, Flow Space, 8 Dec. 2025
At the time, just one 1990 study had linked radon to leukemia in Great Britain.
—Max Filby, Cincinnati Enquirer, 20 Nov. 2025
While countries like the UK offer radon risk maps, Dallas warns against relying on assumptions.
—Christopher McFadden, Interesting Engineering, 24 Oct. 2025
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Alyssa Goldberg, USA Today, 23 Dec. 2025
Have your home checked for radon and mold.
—Helen Carefoot, Flow Space, 8 Dec. 2025
At the time, just one 1990 study had linked radon to leukemia in Great Britain.
—Max Filby, Cincinnati Enquirer, 20 Nov. 2025
While countries like the UK offer radon risk maps, Dallas warns against relying on assumptions.
—Christopher McFadden, Interesting Engineering, 24 Oct. 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 3 Jan. 2026.
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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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