thermosphere
/ˈθɝməsfɪɚ/noun
thermosphere is spelled T-H-E-R-M-O-S-P-H-E-R-E: 12 letters. It appears about once in every 16 million words in written English, the 119,826th most frequent word form (wordfreq, 2021 data). As a noun, thermosphere means “The layer of the Earth's atmosphere directly above the mesosphere and directly below the exosphere” (English Wiktionary, September 2026). The plural of thermosphere is thermospheres.
How many letters and syllables are in thermosphere?
| Letters | 12: T-H-E-R-M-O-S-P-H-E-R-E |
|---|---|
| In writing | about once in every 16 million words; the 119,826th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is thermosphere?
Thermosphere appears about once in every 16 million words in written English, the 119,826th 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 thermosphere?
- UK /ˈθɜːməsfɪə/
- US /ˈθɝməsfɪɚ/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Rho9998-thermosphere.wav, Wikimedia Commons (author and licence on each file's page).
Forms of thermosphere
- thermospheres plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does thermosphere mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The layer of the Earth's atmosphere directly above the mesosphere and directly below the exosphere.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Thermosphere in Spanish, French, German and Portuguese
In the sense layer of the Earth's atmosphere:
| Language | Words |
|---|---|
| French | thermosphère |
| German | Thermosphäre |
| Portuguese | termosfera |
| Spanish | termosfera |
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.
Where does thermosphere come from?
From thermo- + -sphere.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).