Definition of radon
: a heavy radioactive gaseous element formed by the decay of radium — see Chemical Elements Table
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Recent Examples of radon from the Web
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The school board approved spending up to $50,000 on radon testing at a meeting Monday, but Tijerina said the projected testing cost would be around $35,600.
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The remaining 15 percent of the funds raised would be used to assist homeowners whose homes are sinking in New Haven and others dealing with lead and radon abatement.
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But unlike cosmic radiation or radon gas, plutonium can lodge itself inside the body and deliver tissue-damaging alpha particles over a lifetime.
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East Aurora School District 131 is set to test buildings for radon.
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But unlike cosmic radiation or radon gas, plutonium can lodge itself inside the body and deliver tissue damaging alpha particles over a lifetime.
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At least $150 million is slated to be spent addressing safety problems, including lead paint, radon, outdated fire alarms and leaking roofs.
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The test kits will be available to Middletown homeowners who have not previously tested for radon.
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The most likely explanation is that many carcinogens are mixing together: adding radon or asbestos to smoking pushes the risk up to 300 times higher than normal, and Tucker thinks the same is likely true for arsenic and chromium.
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.
Origin and Etymology of radon
International Scientific Vocabulary, from radium
RADON Defined for English Language Learners
Definition of radon for English Language Learners
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: a radioactive element which is a gas that is used medically in cancer treatments
Medical Dictionary
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
Learn More about radon
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See words that rhyme with radon Spanish Central: Translation of 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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