asthenosphere
/asˈθɛnə(ʊ)sfɪə/noun
asthenosphere is spelled A-S-T-H-E-N-O-S-P-H-E-R-E: 13 letters. It appears about once in every 24 million words in written English, the 148,541st most frequent word form (wordfreq, 2021 data). As a noun, asthenosphere means “A portion of the Earth's upper mantle, below the lithosphere” (English Wiktionary, September 2026). The plural of asthenosphere is asthenospheres.
How many letters and syllables are in asthenosphere?
| Letters | 13: A-S-T-H-E-N-O-S-P-H-E-R-E |
|---|---|
| In writing | about once in every 24 million words; the 148,541st 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 asthenosphere?
Asthenosphere appears about once in every 24 million words in written English, the 148,541st 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 asthenosphere?
- UK /asˈθɛnə(ʊ)sfɪə/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-asthenosphere.wav, Wikimedia Commons (author and licence on each file's page).
Forms of asthenosphere
- asthenospheres plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does asthenosphere mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A portion of the Earth's upper mantle, below the lithosphere.
Holonyms: upper mantle, outer mantle < mantle < Earth
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Asthenosphere in Spanish, French, German and Portuguese
In the sense the zone of the Earth's upper mantle, below the lithosphere:
| Language | Words |
|---|---|
| French | asthénosphère |
| German | Asthenosphäre |
| Spanish | astenosfera |
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 asthenosphere come from?
From astheno- + -sphere.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).