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.
Radon
/ˈɹeɪdɒn/ name, noun
name, noun ·Rare ·Advanced level
Meaning at a glance
- Primary sense: The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
- Grammar: radon is listed as name, noun.
- Nearest alternatives: rn, ammonia, atomic number 86, carbon dioxide.
- Useful contrasts: benign air, nonradioactive gas, stable gas.
- Usage evidence: Helium, neon, argon, krypton, xenon and radon are noble gases.
How to use "radon"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "radon" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "radon" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "radon" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "radon" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "radon" is acting as name, noun in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "rn" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "radon", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
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 synonymsAntonyms
benign airnonradioactive gasstable gas
Example
"Helium, neon, argon, krypton, xenon and radon are noble gases."
Common questions
What is a synonym for "radon"?
Common synonyms include: rn, ammonia, atomic number 86, carbon dioxide, chemical element, element.
How do you use "radon" in a sentence?
Helium, neon, argon, krypton, xenon and radon are noble gases.
How do you pronounce "radon"?
Pronounced /ˈɹeɪdɒn/.
Etymology
Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).