1. radon

noun. ['ˈreɪˌdɑːn'] a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health.


  • Rn
  • atomic number 86
  • inert gas
  • element
  • chemical element
  • argonon


  • curve

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Rhymes with Radon

  • celadon
  • oxdon
  • ramadan
  • slobodan

How do you pronounce radon?

Pronounce radon as ˈreɪˌdɑn.

US - How to pronounce radon in American English

UK - How to pronounce radon in British English

Sentences with radon

1. Noun, singular or mass
Understanding the nature of radon and how to test for it can make your home a safer place.

2. Adjective
This testing will give you a radon concentration in units of picoCuries per liter of air (pCi/L).

3. Verb, base form
The uranium slowly decays, and radon gas is a byproduct of that decay.