radon

Chemical element
Rn
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Next: francium (Fr)

Contraction of radium emanation, since the element appears in the radioactive decay of radium.

• enPR: rā'dŏn, IPA^(key): /ˈɹeɪdɒn/

• Audio (Southern England):

  (file)

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.

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.^[1]

• actinon
• radium emanation

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

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

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

• Audio:

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• Hyphenation: ra‧don

radon (uncountable)

1. radon

• edelgas

From Spanish radón.

• Audio:

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• IPA^(key): /radon/, [ra.ð̞õ̞n]

radon inan

1. radon

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

Other scripts
Cyrillic	радон
Roman

Borrowed from Russian радон (radon).

radon

1. radon

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

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

radon m inan

1. radon

radon

1. radon

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

• Audio:

  (file)

radon n (uncountable)

1. radon

radon

1. accusative singular of rado

From English radon.

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

radon

1. radon

• raadon

• “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

• andro-

• IPA^(key): /ʁa.dɔ̃/

• Audio:

  (file)

• Rhymes: -ɔ̃

radon m (uncountable)

1. radon

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

• rando

radon m (uncountable)

1. radon

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

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

radon (usually uncountable, plural radonok)

1. radon

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

Chemical element
Rn
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Next: fransín (Fr)

radon n (genitive singular radons, no plural)

1. radon (chemical element)

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

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

radon m (invariable)

1. (chemistry) radon

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

radon

1. Rōmaji transcription of ラドン

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

radon n (genitive radī); second declension

1. radon

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

Chemical element
Rn
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Next: fransium (Fr)

From English radon.

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

radon

1. radon (chemical element)

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

Borrowed from Italian radon.

• IPA^(key): /ˈraː.dɔn/

radon m

1. (chemistry) radon (chemical element)

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

Learned borrowing from New Latin radon.

• IPA^(key): /ˈra.dɔn/

• Audio 1:

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• Audio 2:

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• Rhymes: -adɔn
• Syllabification: ra‧don

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)

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

Borrowed from French radon.

radon n (uncountable)

1. radon

radon m (Cyrillic spelling радон)

1. radon

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

• IPA^(key): /ráːdɔn/, /radóːn/

radọ̑n or radón m inan

1. radon

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

• “radon”, in Slovarji Inštituta za slovenski jezik Frana Ramovša ZRC SAZU (in Slovene), 2014–2024

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

• IPA^(key): /raˈdoːn/

• Audio:

  (file)

radon n (uncountable)

1. radon

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

• andor, donar, ordna, rodna

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

Borrowed from French radon.

• Audio:

  (file)

radon (definite accusative radonu, plural radonlar)

1. radon

Inflection
Nominative	radon
Definite accusative	radonu
	Singular	Plural
Nominative	radon	radonlar
Definite accusative	radonu	radonları
Dative	radona	radonlara
Locative	radonda	radonlarda
Ablative	radondan	radonlardan
Genitive	radonun	radonların

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

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

Borrowed from English radon.

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

radon m (uncountable, not mutable)

1. radon

• 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