Standard Lemma guide

exosphere

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

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • 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