exosphere
Pronunciation: /ˈɛksəʊsfɪə/
The English word “exosphere” has 2 meanings listed here.
noun
- the uppermost layer of a planet's atmosphere
- an extremely thin atmosphere, as on Saturn's moon Dione
Etymology
From exo- + -sphere.
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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.