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: 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
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
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Word History
Etymology
International Scientific Vocabulary, from radium
First Known Use
1918, in the meaning defined above
Dictionary Entries Near radon
Cite this Entry
“Radon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radon. Accessed 7 Dec. 2024.
Kids 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 TableMore from Merriam-Webster on radon
Nglish: Translation of radon for Spanish Speakers
Britannica English: Translation of radon for Arabic Speakers
Britannica.com: Encyclopedia article about radon
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