ra·​don | \ ˈrā-ˌdän How to pronounce radon (audio) \

Definition of radon

: 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 The lab will then send you the radon test result within a few weeks. courant.com, "Community News For The West Hartford Edition," 25 Nov. 2020 The West Hartford-Bloomfield Health District has free radon test kits. courant.com, "Community News For The West Hartford Edition," 25 Nov. 2020 Professional radon mitigators typically install soil-depressurization systems. Beth Decarbo, WSJ, "Your Latest D-I-Y Project: Testing Your Home for Lead and Radon," 22 Oct. 2020 For example, one for radon might not tell you anything about VOCs or mold. Courtney Campbell, USA TODAY, "What are home air quality monitors and should you buy one," 16 Sep. 2020 President Donald Trump’s budget proposal also includes $5 million for radon testing and mitigation in public housing. al, "Huntsville Housing Authority confirms radon problems identified by AL.com investigation, doesn’t tell tenants," 23 Feb. 2020 Just last month, an independent watchdog launched a review of whehter the U.S. Department of Housing and Urban Development is protecting tenants in public housing from exposure to radon, which causes cancer. oregonlive, "The Oregonian/OregonLive wins 2 National Headliner awards," 8 Apr. 2020 This isn’t the first time the Office of Inspector General has been made aware of HUD’s inaction on radon. oregonlive, "HUD’s independent watchdog launches review of radon policies after Oregonian investigation," 19 Mar. 2020 Independent testing by reporters in a sampling of cities revealed high radon in units in Denver, Worcester, Massachusetts, and Huntsville, Alabama. oregonlive, "Housing Secretary Ben Carson finally talks radon with lawmakers, makes no promises," 6 Mar. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radon.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of radon

1918, in the meaning defined above

History and Etymology for radon

International Scientific Vocabulary, from radium

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Statistics for radon

Cite this Entry

“Radon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radon. Accessed 7 May. 2021.

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More Definitions for radon



English Language Learners Definition of radon

: a radioactive element which is a gas that is used medically in cancer treatments


ra·​don | \ ˈrā-dän How to pronounce radon (audio) \

Medical Definition of radon

: 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 Table

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More 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

Comments on radon

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