Meanings
radon1
- uncountablechemistryThe chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
- countablechemistryAn atom of this element.
- uncountableRadon-222 (22286Rn), the most stable isotope of said element.
Synonyms: exradio, radeon, radium emanation
Radon2
- A surname from German.
- Johann Radon (1887-1956), an Austrian mathematician with results in measure theory, functional analysis and geometry.
Synonyms & antonyms
nounRadon-222 (22286Rn), the most stable isotope of said element.
More synonyms by meaning
nouna 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
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
- Latinradius
- Frenchradio-
- Proto-Indo-European*h₂eǵ-
- Proto-Indo-European*h₂éǵeti
- Proto-Italic*agō
- Latinagō
- Ancient Greekἐνεργητικός (energētikós)
- Latināctīvu
- Old Frenchactif
- Frenchactif
- Frenchradio(actif)
- Frenchradium
- Englishradium
- Proto-Indo-European*h₁éǵʰ
- Proto-Indo-European*h₁éǵʰs
- Proto-Italic*eks
- Latinex
- Latinē
- Proto-Indo-European*meh₂-
- Proto-Indo-European*meh₂no-
- Proto-Italic*māno-
- Latinmānō
- Latinmānāre
- Latinēmānāre
- Englishemanate
- Englishemanation
- Englishradium emanation
- Englishradon
Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).
More words from radium emanation<ety, [<LINK(['radium']){} >, ' ', <LINK(['emanation']){} >, '<ety
Full word history & related roots →Translations
Afrikaans radon
- radonchemical element
Arabic رَادُون
- رَادُون (rādūn)chemical element
Basque radona
- radonachemical element
Bulgarian радо́н
- радо́н (radón)chemical element
Catalan radó
- radóchemical element
Chinese Mandarin 氡
- 氡 (dōng)chemical element
Czech radon
- radonchemical element
Danish radon
- radonchemical element
Dutch radon
- radonchemical element
Esperanto radono
- radonochemical element
Estonian radoon
- radoonchemical element
Finnish radon
- radonchemical element
French radon
- radonchemical element
German Radon
- Radonchemical element
Greek ραδόνιο
- ραδόνιο (radónio)chemical element
Hebrew רדון
- רדון (radón)chemical element
Hindi तैजसाति
- तैजसाति (taijsāti)chemical element
Hungarian radon
- radonchemical element
Icelandic radon
- radonchemical element
Irish radón
- radónchemical element
Italian radon, rado
- radonchemical element
- radochemical element
Japanese ラドン
- ラドン (radon)chemical element
Korean 라돈
- 라돈 (radon)chemical element
Latvian radons
- radonschemical element
Lithuanian radonas
- radonaschemical element
Malay radon
- radonchemical element
Norwegian radon
- radonchemical element
Persian رادون
- رادون (râdon)chemical element
Polish radon
- radonchemical element
Portuguese rádon
- rádonchemical element
Romanian radon
- radonchemical element
Russian радо́н
- радо́н (radón)chemical element
Slovak radón
- radónchemical element
Spanish radón
- radónchemical element
Swedish radon
- radonchemical element
Tamil ரேடோன், ஆரகன்
- ரேடோன் (rēṭōṉ)chemical element
- ஆரகன் (ārakaṉ)chemical element
Thai เรดอน
- เรดอน (ree-dɔ̂n)chemical element
Turkish radon
- radonchemical element
Ukrainian радо́н
- радо́н (radón)chemical element
Vietnamese rađơn
- rađơnchemical element
Rhymes & wordplay
Anagrams
Cite this entry
radon. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/radon
“radon.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/radon. Accessed November 2, 2026.
WatkinsX Dictionary, s.v. “radon,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/radon.
Source: radon on Wiktionary, CC BY-SA 4.0.