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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Words that Rhyme 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

Example sentences of the word 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.