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Definition of radon

radon

/ˈreɪ.dɒn/
ra · don
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radon Lexical Profile

radon Game Scores & Validity

• noun

1

A chemical element (symbol Rn, atomic number 86) that is a colorless, odorless, radioactive noble gas formed naturally by the radioactive decay of radium in soil and rock, often accumulating as an indoor health hazard.

Example

"The homeowners installed a ventilation system in their basement after a routine inspection detected elevated levels of radon."

• Nearby Words

radish
radium
radius
radon
raffish
raffle
rafflesia

Word Origin & Etymology

Coined in 1918 from 'radium' (the radioactive element from whose decay it is produced, ultimately from Latin radius meaning 'ray') plus the chemical suffix '-on' used for noble gases (modeled on 'argon' and 'neon').

Cite this Entry

Wordmom. (2026). Definition of Radon. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/radon
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