radon

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radon^¹

/ˈɹeɪdɒn/

Where it comes from

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

noun

uncountable The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
countable An atom of this element.
uncountable Radon-222 (22286Rn), the most stable isotope of said element.
Similar: exradio, radeon, radium emanation

Similar: emanation, niton

Radon^²

proper noun

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

Thesaurus

noun

Similar: emanation, niton

Translations

Every language

noun chemical element

Español	radón
한국어	라돈 radon
日本語	ラドン radon
中文	氡 dōng
हिन्दी	तैजसाति taijsāti
Português	rádon
Français	radon
Deutsch	Radon
Italiano	radon, rado
Ελληνικά	ραδόνιο radónio
Română	radon
Русский	радо́н radón
Tiếng Việt	rađơn
العربية	رَادُون rādūn
עברית	רדון radón

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MLA

"radon." Wiktionary, via Micwyn, micwyn.com/word/radon. Accessed 6 Nov. 2026.

APA

radon. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/radon

Chicago

"radon." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/radon.

BibTeX

@misc{radon_2026,
  title = {radon},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/radon},
  urldate = {2026-11-06}
}