noun
radon
RAY-don
noun
1
A colorless, odorless, radioactive noble gas (symbol Rn) that can build up in basements and poses a health risk.
"They tested the basement for radon before buying the house."
How to Use Radon
Learner’s notesIn plain EnglishA radioactive gas that occurs naturally in soil and rock and can seep into homes.
Common pairings
radon gas
radon testing
radon exposure
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They tested the basement for _____ before buying the house.
Etymology
A contraction of "radium emanation", since the gas is produced by radium's radioactive decay.