: 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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Best air quality monitors This monitor detects radon, carbon dioxide, VOCs, humidity, temperature and atmospheric pressure, giving you a broad understanding of the quality of the air in your home.
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Bestreviews, Chicago Tribune, 17 Mar. 2026
Colorado’s state health department has a low-income radon mitigation assistance program that can pay for radon mitigation for people who are eligible based on income requirements.
—Jan Lowery, The Conversation, 20 Feb. 2026
Rehabilitating a house can take on many different forms, Pfeifer said, like replacing aging kitchen appliances, lead and asbestos abatement, radon mitigation or adding on a bedroom.
—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
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Bestreviews, Chicago Tribune, 17 Mar. 2026
Colorado’s state health department has a low-income radon mitigation assistance program that can pay for radon mitigation for people who are eligible based on income requirements.
—Jan Lowery, The Conversation, 20 Feb. 2026
Rehabilitating a house can take on many different forms, Pfeifer said, like replacing aging kitchen appliances, lead and asbestos abatement, radon mitigation or adding on a bedroom.
—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
See All Example Sentences for radon
Cite this Entry
“Radon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radon. Accessed 20 Mar. 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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