noun · 3 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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Received-Pronunciation:/ˈɛksəʊsfɪə/
UK:Recorded audio is listed in the source snapshot.
General-American:/ˈɛksoʊsfɪɚ/
1
noun
Meaning 1
the uppermost layer of a planet's atmosphere
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
an extremely thin atmosphere, as on Saturn's moon Dione
Definition source: English Wiktionary via Wiktextract
Examples
"Scientists weren't even sure Dione would be big enough to hang on to an exosphere" ('Cassini Detects Hint of Fresh Air at Dione', , JPL, Mar. 02, 2012)
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
the outermost atmospheric layer
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: layer
History
Etymology
From exo- + -sphere.
Across languages
Translations
49 source translations are retained for this English entry.
Albanian:
egzosfera
— the uppermost layer of a planet's atmosphere
Armenian:
էկզոսֆերա
(ēkzosfera)
— the uppermost layer of a planet's atmosphere
Azerbaijani:
ekzosfer
— the uppermost layer of a planet's atmosphere
Basque:
exosfera
— the uppermost layer of a planet's atmosphere
Belarusian:
экзасфера
(ekzasfjera)
— the uppermost layer of a planet's atmosphere
Catalan:
exosfera
— the uppermost layer of a planet's atmosphere
Chinese Mandarin:
散逸層 /散逸层
(sànyìcéng)
— the uppermost layer of a planet's atmosphere
Chinese Mandarin:
外氣層 /外气层
(wàiqìcéng)
— the uppermost layer of a planet's atmosphere
Czech:
exosféra
— the uppermost layer of a planet's atmosphere
Danish:
exosfære
— the uppermost layer of a planet's atmosphere
Dutch:
exosfeer
— the uppermost layer of a planet's atmosphere
Esperanto:
eksosfero
— the uppermost layer of a planet's atmosphere
Estonian:
eksosfäär
— the uppermost layer of a planet's atmosphere
Finnish:
eksosfääri
— the uppermost layer of a planet's atmosphere
French:
exosphère
— the uppermost layer of a planet's atmosphere
Galician:
exosfera
— the uppermost layer of a planet's atmosphere
Georgian:
ეგზოსფერო
(egzospero)
— the uppermost layer of a planet's atmosphere
German:
Exosphäre
— the uppermost layer of a planet's atmosphere
Greek:
εξώσφαιρα
(exósfaira)
— the uppermost layer of a planet's atmosphere
Haitian Creole:
egzosfè
— the uppermost layer of a planet's atmosphere
Hungarian:
exoszféra
— the uppermost layer of a planet's atmosphere
Icelandic:
úthvolf
— the uppermost layer of a planet's atmosphere
Indonesian:
eksosfer
— the uppermost layer of a planet's atmosphere
Irish:
eisisféar
— the uppermost layer of a planet's atmosphere
Italian:
esosfera
— the uppermost layer of a planet's atmosphere
Japanese:
外気圏
(gaikiken)
— the uppermost layer of a planet's atmosphere
Kazakh:
экзосфера
(ékzosfera)
— the uppermost layer of a planet's atmosphere
Kyrgyz:
экзосфера
(ekzosfera)
— the uppermost layer of a planet's atmosphere
Latvian:
eksosfēra
— the uppermost layer of a planet's atmosphere
Lithuanian:
egzosfera
— the uppermost layer of a planet's atmosphere
Malay:
eksosfera
— the uppermost layer of a planet's atmosphere
Norwegian Bokmål:
eksosfære
— the uppermost layer of a planet's atmosphere
Norwegian Nynorsk:
eksosfære
— the uppermost layer of a planet's atmosphere
Occitan:
exosfèra
— the uppermost layer of a planet's atmosphere
Persian:
اگزوسفر
(egzosfer)
— the uppermost layer of a planet's atmosphere
Polish:
egzosfera
— the uppermost layer of a planet's atmosphere
Portuguese:
exosfera
— the uppermost layer of a planet's atmosphere
Romanian:
exosferă
— the uppermost layer of a planet's atmosphere
Russian:
экзосфе́ра
(ekzosféra)
— the uppermost layer of a planet's atmosphere
Serbo-Croatian:
егзосфера
— the uppermost layer of a planet's atmosphere
Serbo-Croatian:
egzosfera
— the uppermost layer of a planet's atmosphere
Slovak:
exosféra
— the uppermost layer of a planet's atmosphere
Slovene:
eksosfera
— the uppermost layer of a planet's atmosphere
Spanish:
exosfera
— the uppermost layer of a planet's atmosphere
Swedish:
exosfär
— the uppermost layer of a planet's atmosphere
Turkish:
ekzosfer
— the uppermost layer of a planet's atmosphere
Turkmen:
ekzosfera
— the uppermost layer of a planet's atmosphere
Ukrainian:
екзосфера
(ekzosfera)
— the uppermost layer of a planet's atmosphere
Vietnamese:
tầng ngoài
— the uppermost layer of a planet's atmosphere