What does "radon" mean?

The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.

What is a synonym for "radon"?

Common synonyms include: actinon, ammonia, atomic number 86, carbon dioxide, element, emanation.

Radon

//ˈɹeɪdɒn// name, noun

name, noun ·Uncommon ·Advanced level

Definitions

Noun

1
The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas. uncountable
2
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 wordnet
3
Radon-222 (²²²₈₆Rn), the most stable isotope of said element. uncountable

Proper Noun

1
A surname from German.
2
A surname from German.; Johann Radon (1887-1956), an Austrian mathematician with results in measure theory, functional analysis and geometry.

Synonyms

All synonyms

actinon ammonia atomic number 86 carbon dioxide element emanation

Example

More examples

"Helium, neon, argon, krypton, xenon and radon are noble gases."

Etymology

Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.