: 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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But a series of major unforeseen problems soon cropped up, including dangerous hydrogen accumulation in piping and ancillary vessels, and inadequate ventilation for managing radon and other gases that are produced as the radioactive waste material breaks down.
—
IEEE Spectrum, 28 Apr. 2020
And who has the responsibility to get rid of the radon?
—Jill Terreri Ramos, New York Times, 26 Apr. 2025
Even so, fixing radon on a large scale can seem like playing a carnival game of whack-a-mole as parts of Idaho continue to see dramatically high levels of the gas.
—Nick Rosenberger, Idaho Statesman, 22 Apr. 2025
First, there is no building in the United States without some radon.
—Nick Rosenberger, Idaho Statesman, 22 Apr. 2025
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IEEE Spectrum, 28 Apr. 2020
And who has the responsibility to get rid of the radon?
—Jill Terreri Ramos, New York Times, 26 Apr. 2025
Even so, fixing radon on a large scale can seem like playing a carnival game of whack-a-mole as parts of Idaho continue to see dramatically high levels of the gas.
—Nick Rosenberger, Idaho Statesman, 22 Apr. 2025
First, there is no building in the United States without some radon.
—Nick Rosenberger, Idaho Statesman, 22 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 8 Jul. 2025.
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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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