osteuropäisch
Eastern European
Relating to Eastern Europe; originating from Eastern Europe.
Die Speisekarte bietet viele osteuropäische Spezialitäten.
The menu offers many Eastern European specialties.

Eastern European
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Eastern European
Relating to Eastern Europe; originating from Eastern Europe.
Die Speisekarte bietet viele osteuropäische Spezialitäten.
The menu offers many Eastern European specialties.

The adjective is made up of 'Ost' (east) and 'europäisch' (European). This structure is also used for other compass directions.
Er interessiert sich sehr für die osteuropäische Geschichte des 20. Jahrhunderts.
He is very interested in the Eastern European history of the 20th century.
Adjectives derived from geographical names and ending in '-isch' are written in lowercase in German. So you write 'osteuropäische Länder' (Eastern European countries), not 'Osteuropäische Länder'.
Viele osteuropäische Städte haben eine wunderschöne Altstadt.
Many Eastern European cities have a beautiful old town.
The adjective is often combined with nouns from the areas of culture, politics, and geography, for example 'osteuropäische Küche' (Eastern European cuisine), 'osteuropäische Sprachen' (Eastern European languages), or 'osteuropäische Politik' (Eastern European politics).
Ich liebe die osteuropäische Küche, besonders die polnischen Piroggen.
I love Eastern European cuisine, especially Polish pierogi.
European
'europäisch' and 'osteuropäisch' both refer to Europe. The difference is how specific they are. 'europäisch' means Europe in general or sometimes the European Union. 'osteuropäisch' means only the eastern part of Europe or something that comes from there. They can be confused if you only know that something comes from Europe. If the exact region is important, 'osteuropäisch' is more precise. If you mean all of Europe or the EU, 'europäisch' fits.

Er hört gern osteuropäische Musik, besonders aus Polen und der Ukraine.
He enjoys listening to Eastern European music, especially from Poland and Ukraine.
Für die Reise braucht sie eine europäische Krankenversicherungskarte.
For the trip, she needs a European Health Insurance Card.