radon
/ˈɹeɪdɒn/noun
radon is spelled R-A-D-O-N: 5 letters and 2 syllables. It appears about once in every 1 million words in written English, the 33,236th most frequent word form (wordfreq, 2021 data). As a noun, radon means “The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas” (English Wiktionary, September 2026).
How many letters and syllables are in radon?
| Letters | 5: R-A-D-O-N |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | about once in every 1 million words; the 33,236th most frequent word form |
| Wrong spellings searched | none measured in search |
| Same letters |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is radon?
Radon appears about once in every 1 million words in written English, the 33,236th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce radon?
- /ˈɹeɪdɒn/
Radon has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Tesco250-radon.wav, LL-Q1860_(eng)-Naomi_Persephone_Amethyst_(NaomiAmethyst)-radon.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with radon?
No other word on PlainSpell ends in the same sounds as radon.
Spelled with the same letters in another order: adorn, andor, rando, andro.
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
What does radon mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
- 2
An atom of this element.
- 3
Radon-222 (22286Rn), the most stable isotope of said element.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Radon in Spanish, French, German and Portuguese
In the sense chemical element:
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.