The Britannica Dictionary
mobile search
Home
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
×
Britannica Homepage
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
The Britannica Dictionary
radon
1 ENTRIES FOUND:
radon
(noun)
radon
/
ˈ
reɪˌdɑːn/
noun
radon
/
ˈ
reɪˌdɑːn/
noun
Britannica Dictionary definition of RADON
[
noncount
]
:
a radioactive element which is a gas that is used medically in cancer treatments
ASK THE EDITOR
What does "-ness" mean at the end of an adjective?
See the answer »
QUIZZES
Vocabulary Quiz
Test your word power
Take the Quiz »
Name That Thing
Take our visual quiz
Test Your Knowledge »
WORD OF THE DAY
repulsive
:
causing strong dislike or disgust
Learn More »
