: a heavy radioactive gaseous element formed by the decay of radium see Chemical Elements Table
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Overall Winner World Food Photography Awards The Khoja Obi Garm sanatorium (health hotel) is a colossal concrete complex built on radon-rich hot springs in the mountains of Tajikistan.—
Cecilia Rodriguez,
Forbes.com,
18 June 2026 Order a low-cost radon test kit from the American Lung Association.—
Ryan Brennan,
Kansas City Star,
19 May 2026 Low-cost radon test kits are available through the American Lung Association or by calling 1-800-SOS-RADON.—
Ryan Brennan
may 19,
Charlotte Observer,
19 May 2026 That means family history, radon exposure, occupational risk, military exposure.—
Armstrong Williams,
Baltimore Sun,
1 May 2026 See All Example Sentences for 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