radon

See also: Appendix:Variations of "radon"

English

Chemical element
Rn
Previous: astatine (At)
Next: francium (Fr)

Etymology

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

Pronunciation

• enPR: rā'dŏn, IPA^(key): /ˈɹeɪdɒn/

• Audio (Southern England):

  (file)

Noun

radon (uncountable)

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

Usage notes

The isotopes ²²²Rn, ²²⁰Rn, and ²¹⁹Rn were discovered independently, and were called radon (Rn), thoron (Tn), and actinon (An) respectively. In 1957, it was finally decided that the name radon should refer to the element in general, regardless of isotope. Thoron still survives as a name for ²²⁰Rn today; actinon is mostly obsolete, because ²¹⁹Rn is short-lived.

Synonyms

a chemical element

• emanation (obsolete)
• niton (obsolete)

radon-222; an isotope of radon

• exradio (archaic)
• radeon (obsolete)
• radium emanation (obsolete)

Hyponyms

a chemical element

• actinon (An; radon-219)
• radon (Rn; radon-222)
• thoron (Tn; radon-220)

Derived terms

• eka-radon
• radon difluoride
• radon fluoride
• radon seed

Related terms

• radium

Translations

chemical element

• Afrikaans: radon (af)
• Arabic: رَادُون m (rādun)
• Armenian: ռադոն (hy) (ṙadon)
• Asturian: radón (ast) m
• Basque: radona
• Belarusian: радо́н m (radón)
• Bulgarian: радо́н m (radón)
• Catalan: radó (ca) m
• Chinese:

  Mandarin: 氡 (zh) (dōng)

• Czech: radon (cs) m
• Danish: radon (da) n
• Dhivehi: please add this translation if you can
• Dutch: radon (nl) n
• Esperanto: radono (eo)
• Estonian: radoon (et)
• Faroese: radon n
• Finnish: radon (fi)
• French: radon (fr) m
• Friulian: radon m
• Galician: radon (gl) m
• Georgian: რადონი (radoni)
• German: Radon (de) n
• Greek: ραδόνιο (el) n (radónio)
• Hebrew: רדון (he) m (radón)
• Hindi: तैजसाति (taijsāti)
• Hungarian: radon (hu)
• Icelandic: radon (is) n
• Irish: radón m
• Italian: radon (it) m, rado (it) m
• Japanese: ラドン (ja) (radon)
• Kashubian: redón
• Kazakh: радон (radon)
• Khmer: រ៉ាដុង (raadong)
• Korean: 라돈 (ko) (radon)
• Latvian: radons m
• Lithuanian: radonas (lt) m
• Luxembourgish: Radon
• Macedonian: радон m (radon)
• Malay: radon
• Maltese: radon m
• Manx: raadon
• Mongolian: радон (mn) (radon)
• Norwegian: radon n
• Occitan: radon (oc) m
• Persian: رادون (fa) (râdon)
• Polish: radon (pl) m
• Portuguese: rádon (pt) m
• Romanian: radon (ro) n
• Russian: радо́н (ru) m (radón)
• Serbo-Croatian:

  Cyrillic: радон m

  Roman: radon (sh) m

• Slovak: radón (sk) m
• Slovene: radon (sl) m
• Spanish: radón (es) m
• Swedish: radon (sv) n
• Tajik: радон (radon)
• Tamil: ரேடோன் (rēṭōṉ), ஆரகன் (ta) (ārakaṉ)
• Thai: เรดอน (ree-dɔ̂n)
• Turkish: radon (tr)
• Ukrainian: радо́н m (radón)
• Uzbek: radon (uz), радон (uz) (radon)
• Vietnamese: rađơn
• Volapük: radonin (vo)
• West Frisian: radon n

The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.

Translations to be checked

• Albanian: ^{(please verify)} radon
• Breton: ^{(please verify)} radon (br)
• Cornish: ^{(please verify)} radon
• Lithuanian: ^{(please verify)} radonas (lt)
• Welsh: ^{(please verify)} radon (cy)

See also

• actinon
• radium emanation

References

• Radon on the British Royal Society of Chemistry's online periodic table

Anagrams

• Ardon, Daron, rando, Andro, Ronda, Norad, NORAD, Doran, andro, Drona, andor, norad, Nador, and/or, Nardo, adorn, andro-

Afrikaans

Chemical element
Rn
Previous: astaat (At)
Next: frankium (Fr)

Pronunciation

• Audio:

  (file)

• Hyphenation: ra‧don

Noun

radon (uncountable)

1. radon

Hypernyms

• edelgas

Basque

Etymology

From Spanish radón.

Pronunciation

• IPA^(key): /radon/ [ra.ð̞õn]

• Audio:

  (file)

• Rhymes: -adon, -on
• Hyphenation: ra‧don

Noun

radon inan

1. radon

Declension

Declension of radon (inanimate, singular only, ending in consonant)

	indefinite	singular
absolutive	radon	radona
ergative	—	radonak
dative	—	radonari
genitive	—	radonaren
comitative	—	radonarekin
causative	—	radonarengatik
benefactive	—	radonarentzat
instrumental	radonez	radonaz
inessive	—	radonean
locative	—	—
allative	—	—
terminative	—	—
directive	—	—
destinative	—	—
ablative	—	—
partitive	radonik	—
prolative	radontzat	—

Further reading

• “radon”, in Euskaltzaindiaren Hiztegia [Dictionary of the Basque Academy] (in Basque), Euskaltzaindia [Royal Academy of the Basque Language]

Crimean Tatar

Other scripts
Cyrillic	радон
Roman

Etymology

Borrowed from Russian радон (radon).

Noun

radon

1. radon

Declension

Declension of radon

	singular	plural
nominative	radon	radonlar
genitive	radonnıñ	radonlarnıñ
dative	radonğa	radonlarğa
accusative	radonnı	radonlarnı
locative	radonda	radonlarda
ablative	radondan	radonlardan

References

• Mirjejev, V. A., Usejinov, S. M. (2002) Ukrajinsʹko-krymsʹkotatarsʹkyj slovnyk [Ukrainian – Crimean Tatar Dictionary]‎^[1], Simferopol: Dolya, →ISBN
• “radon”, in Luğatçıq (in Russian)

Czech

Pronunciation

• IPA^(key): [ˈradon]
• IPA^(key): [ˈradoːn]

Noun

radon m inan

1. radon

Declension

Declension of radon (hard masculine inanimate)

	singular	plural
nominative	radon	radony
genitive	radonu	radonů
dative	radonu	radonům
accusative	radon	radony
vocative	radone	radony
locative	radonu	radonech
instrumental	radonem	radony

Danish

Chemical element
Rn
Previous: astat (At)
Next: francium (Fr)

Etymology

From Latin radium +‎ -on.

Noun

radon n (singular definite radonet, not used in plural form)

1. radon

Declension

Declension of radon

neuter gender	singular
	indefinite	definite
nominative	radon	radonet
genitive	radons	radonets

References

• “radon” in Den Danske Ordbog

Dutch

Chemical element
Rn
Previous: astaat (At)
Next: francium (Fr)

Pronunciation

• Audio:

  (file)

Noun

radon n (uncountable)

1. radon

Esperanto

Noun

radon

1. accusative singular of rado

Finnish

Etymology

From English radon.

Pronunciation

• IPA^(key): /ˈrɑ(ː)don/, [ˈrɑ̝(ː)do̞n]
• Rhymes: -ɑdon
• Syllabification^(key): ra‧don
• Hyphenation^(key): ra‧don

Noun

radon

1. radon

Declension

Inflection of radon (Kotus type 6/paperi, no gradation)
nominative		radon	radonit
genitive		radonin	radonien radoneiden radoneitten
partitive		radonia	radoneita radoneja
illative		radoniin	radoneihin
		singular	plural
nominative		radon	radonit
accusative	nom.	radon	radonit
	gen.	radonin
genitive		radonin	radonien radoneiden radoneitten
partitive		radonia	radoneita radoneja
inessive		radonissa	radoneissa
elative		radonista	radoneista
illative		radoniin	radoneihin
adessive		radonilla	radoneilla
ablative		radonilta	radoneilta
allative		radonille	radoneille
essive		radonina	radoneina
translative		radoniksi	radoneiksi
abessive		radonitta	radoneitta
instructive		—	radonein
comitative		See the possessive forms below.

Possessive forms of radon (Kotus type 6/paperi, no gradation)

first-person singular possessor singular plural nominative radonini radonini accusative nom. radonini radonini gen. radonini genitive radonini radonieni radoneideni radoneitteni partitive radoniani radoneitani radonejani inessive radonissani radoneissani elative radonistani radoneistani illative radoniini radoneihini adessive radonillani radoneillani ablative radoniltani radoneiltani allative radonilleni radoneilleni essive radoninani radoneinani translative radonikseni radoneikseni abessive radonittani radoneittani instructive — — comitative — radoneineni second-person singular possessor singular plural nominative radonisi radonisi accusative nom. radonisi radonisi gen. radonisi genitive radonisi radoniesi radoneidesi radoneittesi partitive radoniasi radoneitasi radonejasi inessive radonissasi radoneissasi elative radonistasi radoneistasi illative radoniisi radoneihisi adessive radonillasi radoneillasi ablative radoniltasi radoneiltasi allative radonillesi radoneillesi essive radoninasi radoneinasi translative radoniksesi radoneiksesi abessive radonittasi radoneittasi instructive — — comitative — radoneinesi first-person plural possessor singular plural nominative radonimme radonimme accusative nom. radonimme radonimme gen. radonimme genitive radonimme radoniemme radoneidemme radoneittemme partitive radoniamme radoneitamme radonejamme inessive radonissamme radoneissamme elative radonistamme radoneistamme illative radoniimme radoneihimme adessive radonillamme radoneillamme ablative radoniltamme radoneiltamme allative radonillemme radoneillemme essive radoninamme radoneinamme translative radoniksemme radoneiksemme abessive radonittamme radoneittamme instructive — — comitative — radoneinemme second-person plural possessor singular plural nominative radoninne radoninne accusative nom. radoninne radoninne gen. radoninne genitive radoninne radonienne radoneidenne radoneittenne partitive radonianne radoneitanne radonejanne inessive radonissanne radoneissanne elative radonistanne radoneistanne illative radoniinne radoneihinne adessive radonillanne radoneillanne ablative radoniltanne radoneiltanne allative radonillenne radoneillenne essive radoninanne radoneinanne translative radoniksenne radoneiksenne abessive radonittanne radoneittanne instructive — — comitative — radoneinenne third-person possessor singular plural nominative radoninsa radoninsa accusative nom. radoninsa radoninsa gen. radoninsa genitive radoninsa radoniensa radoneidensa radoneittensa partitive radoniaan radoniansa radoneitaan radonejaan radoneitansa radonejansa inessive radonissaan radonissansa radoneissaan radoneissansa elative radonistaan radonistansa radoneistaan radoneistansa illative radoniinsa radoneihinsa adessive radonillaan radonillansa radoneillaan radoneillansa ablative radoniltaan radoniltansa radoneiltaan radoneiltansa allative radonilleen radonillensa radoneilleen radoneillensa essive radoninaan radoninansa radoneinaan radoneinansa translative radonikseen radoniksensa radoneikseen radoneiksensa abessive radonittaan radonittansa radoneittaan radoneittansa instructive — — comitative — radoneineen radoneinensa

Derived terms

compounds

• radonfluoridi
• radonmittari
• radonmittaus
• radonpitoinen

See also

• raadon

Further reading

• “radon”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎^[2] (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-03

Anagrams

• andro-

French

Pronunciation

• IPA^(key): /ʁa.dɔ̃/

• Audio:

  (file)

• Rhymes: -ɔ̃

Noun

radon m (uncountable)

1. radon

Further reading

• “radon”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

Anagrams

• rando

Galician

Noun

radon m (uncountable)

1. radon

Hungarian

Chemical element
Rn
Previous: asztácium (At)
Next: francium (Fr)

Pronunciation

• IPA^(key): [ˈrɒdon]
• Hyphenation: ra‧don
• Rhymes: -on

Noun

radon (usually uncountable, plural radonok)

1. radon

Declension

Inflection (stem in -o-, back harmony)

	singular	plural
nominative	radon	radonok
accusative	radont	radonokat
dative	radonnak	radonoknak
instrumental	radonnal	radonokkal
causal-final	radonért	radonokért
translative	radonná	radonokká
terminative	radonig	radonokig
essive-formal	radonként	radonokként
essive-modal	—	—
inessive	radonban	radonokban
superessive	radonon	radonokon
adessive	radonnál	radonoknál
illative	radonba	radonokba
sublative	radonra	radonokra
allative	radonhoz	radonokhoz
elative	radonból	radonokból
delative	radonról	radonokról
ablative	radontól	radonoktól
non-attributive possessive – singular	radoné	radonoké
non-attributive possessive – plural	radonéi	radonokéi

Possessive forms of radon

possessor	single possession	multiple possessions
1st person sing.	radonom	radonjaim
2nd person sing.	radonod	radonjaid
3rd person sing.	radonja	radonjai
1st person plural	radonunk	radonjaink
2nd person plural	radonotok	radonjaitok
3rd person plural	radonjuk	radonjaik

Icelandic

Chemical element
Rn
Previous: astat (As)
Next: fransín (Fr)

Noun

radon n (genitive singular radons, no plural)

1. radon (chemical element)

Declension

Declension of radon (sg-only neuter)

	singular
	indefinite	definite
nominative	radon	radonið
accusative	radon	radonið
dative	radoni	radoninu
genitive	radons	radonsins

Italian

Chemical element
Rn
Previous: astato (At)
Next: francio (Fr)

Pronunciation

• IPA^(key): /ˈra.don/
• Rhymes: -adon
• Hyphenation: rà‧don

Noun

radon m (invariable)

1. (chemistry) radon

Anagrams

• Andro, Nardò, Rando, andro-, andrò, nardo, ronda

Japanese

Romanization

radon

1. Rōmaji transcription of ラドン

Latin

Pronunciation

• (Classical Latin) IPA^(key): /ˈra.don/, [ˈräd̪ɔn]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈra.don/, [ˈräːd̪on]

Noun

radon n (genitive radī); second declension

1. radon

Declension

Second-declension noun (neuter, Greek-type).

	singular	plural
nominative	radon	rada
genitive	radī	radōrum
dative	radō	radīs
accusative	radon	rada
ablative	radō	radīs
vocative	radon	rada

Malay

Chemical element
Rn
Previous: astatin (At)
Next: fransium (Fr)

Etymology

From English radon.

Pronunciation

• IPA^(key): [radɔn], [redɔn]
• Rhymes: -dɔn, -ɔn

Noun

radon

1. radon (chemical element)

Maltese

Chemical element
Rn
Previous: astat (At)
Next: franċju (Fr)

Etymology

Borrowed from Italian radon.

Pronunciation

• IPA^(key): /ˈraː.dɔn/

Noun

radon m

1. (chemistry) radon (chemical element)

Polish

Chemical element
Rn
Previous: astat (At)
Next: frans (Fr)

Etymology

Learned borrowing from New Latin radon.

Pronunciation

• IPA^(key): /ˈra.dɔn/

• Audio 1:

  (file)

• Audio 2:

  (file)

• Rhymes: -adɔn
• Syllabification: ra‧don

Noun

radon m inan (related adjective radonowy)

1. radon (chemical element (symbol Rn, formerly Ro) with atomic number 86; a colorless, odorless, chemically inert but radioactive noble gas)

Declension

Declension of radon

	singular
nominative	radon
genitive	radonu
dative	radonowi
accusative	radon
instrumental	radonem
locative	radonie
vocative	radonie

Further reading

• radon in Polish dictionaries at PWN
• radon in PWN's encyclopedia

Romanian

Etymology

Borrowed from French radon.

Noun

radon n (uncountable)

1. radon

Declension

Declension of radon

singular only	indefinite	definite
nominative-accusative	radon	radonul
genitive-dative	radon	radonului
vocative	radonule

Serbo-Croatian

Noun

radon m (Cyrillic spelling радон)

1. radon

Slovene

Chemical element
Rn
Previous: astát (At)
Next: fráncij (Fr)

Pronunciation

• IPA^(key): /ráːdɔn/, /radóːn/

Noun

radọ̑n or radón m inan

1. radon

Declension

The diacritics used in this section of the entry are non-tonal. If you are a native tonal speaker, please help by adding the tonal marks.

Masculine inan., hard o-stem
nominative	rádon
genitive	rádona
	singular
nominative (imenovȃlnik)	rádon
genitive (rodȋlnik)	rádona
dative (dajȃlnik)	rádonu
accusative (tožȋlnik)	rádon
locative (mẹ̑stnik)	rádonu
instrumental (orọ̑dnik)	rádonom

Further reading

• “radon”, in Slovarji Inštituta za slovenski jezik Frana Ramovša ZRC SAZU (in Slovene), 2014–2025

Swedish

Chemical element
Rn
Previous: astat (At)
Next: francium (Fr)

Pronunciation

• IPA^(key): /raˈdoːn/

• Audio:

  (file)

Noun

radon n (uncountable)

1. radon

Declension

Declension of radon

		nominative	genitive
singular	indefinite	radon	radons
	definite	radonet	radonets
plural	indefinite	—	—
	definite	—	—

References

• radon in Svensk ordbok (SO)
• radon in Svenska Akademiens ordlista (SAOL)
• radon in Svenska Akademiens ordbok (SAOB)
• Svensk MeSH

Anagrams

• andor, donar, ordna, rodna

Turkish

Chemical element
Ra
Previous: astatin (At)
Next: fransiyum (Fr)

Etymology

Borrowed from French radon.

Pronunciation

• Audio:

  (file)

Noun

radon (definite accusative radonu, plural radonlar)

1. radon

Declension

Declension of radon

	singular	plural
nominative	radon	radonlar
definite accusative	radonu	radonları
dative	radona	radonlara
locative	radonda	radonlarda
ablative	radondan	radonlardan
genitive	radonun	radonların

Further reading

• “radon”, in Turkish dictionaries, Türk Dil Kurumu

Welsh

Chemical element
Rn
Previous: astatin (At)
Next: ffranciwm (Fr)

Etymology

Borrowed from English radon.

Pronunciation

• (North Wales) IPA^(key): /ˈradɔn/
• (South Wales) IPA^(key): /ˈra(ː)dɔn/
• Rhymes: -adon

Noun

radon m (uncountable, not mutable)

1. radon

References

• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “radon”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies