exo-

== English == === Etymology === From Ancient Greek ἔξω (éxō, “outer; external”). === Pronunciation === (General American) IPA(key): /ɛksoʊ-/ (Received Pronunciation) IPA(key): /ɛksəʊ-/ === Prefix === exo- outside; external (astronomy) extrasolar; beyond the Solar System (our solar system) ‎exo- + ‎planet → ‎exoplanet ‎exo- + ‎biology → ‎exobiology ==== Synonyms ==== (outside): out-, ex-, ecto- ==== Antonyms ==== (antonym(s) of “outside”): in-, intra-, en-/em-/im-, end-/endo-/ento- ==== Derived terms ==== exosemantic ==== Related terms ==== ecto- end- / endo- ex- extra- ==== Translations ==== == Catalan == === Etymology === Borrowed from Ancient Greek ἔξω (éxō, “outer; external”). === Prefix === exo- exo- Antonym: endo- ==== Derived terms ==== ==== Related terms ==== meso- == Czech == === Etymology === Derived from Ancient Greek ἔξω (éxō, “outer, external”). === Pronunciation === IPA(key): [ɛɡzo ] === Prefix === exo- exo- Antonym: endo- ==== Derived terms ==== === Further reading === “exo-”, in Slovník spisovného jazyka českého (in Czech), 1960–1971, 1989 exo- in Slovník afixů užívaných v češtině, 2017 == French == === Etymology === From Ancient Greek ἔξω (éxō, “outer; external”). === Prefix === exo- exo- Antonym: endo- ==== Derived terms ==== == German == === Etymology === From Ancient Greek ἔξω (éxō, “outer; external”). === Pronunciation === === Prefix === exo- exo- Antonym: endo- ==== Derived terms ==== == Portuguese == === Etymology === Borrowed from Ancient Greek ἔξω (éxō, “outer; external”). === Pronunciation === === Prefix === exo- exo- Antonym: endo- ==== Derived terms ==== === Further reading === “exo-”, in Dicionário Aulete Digital (in Portuguese), Rio de Janeiro: Lexikon Editora Digital, 2008–2026 “exo-”, in Dicionário Priberam da Língua Portuguesa (in Portuguese), Lisbon: Priberam, 2008–2026 == Spanish == === Etymology === From Ancient Greek ἔξω (éxō, “outer; external”). === Prefix === exo- exo- ==== Derived terms ==== === Further reading === “exo-”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025