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radon Line breaks: radon
Pronunciation: /ˈreɪdɒn/

Definition of radon in English:


[mass noun]
The chemical element of atomic number 86, a rare radioactive gas belonging to the noble gas series. (Symbol: Rn)
Example sentences
  • The ground in some parts of the country releases radon, a radioactive gas that can cause cancer.
  • A review of over 11 studies in uranium miners attributed an observed increase in lung cancer to radon and its progeny and not to uranium.
  • As the pressure in a building is slightly lower than the pressure outdoors, radon will be drawn from the ground into the building.


Early 20th century: from radium, on the pattern of argon.

Definition of radon in:
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