rostocker
Rostock
Relating to the city of Rostock or originating from it. This adjective is not declined.
Die rostocker Altstadt ist sehr sehenswert.
Rostock's old town is very much worth seeing.

Rostock
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Rostock
Relating to the city of Rostock or originating from it. This adjective is not declined.
Die rostocker Altstadt ist sehr sehenswert.
Rostock's old town is very much worth seeing.

The most important thing about this adjective: it is never declined! The form 'rostocker' always stays the same, no matter what gender, case, or number the noun has.
Wir besuchen den rostocker Weihnachtsmarkt.
We are visiting the Rostock Christmas market.
Adjectives derived from city names are often formed with the ending '-er'. This rule applies to many German cities, for example 'Hamburger Hafen' (Hamburg harbor) or 'Kölner Dom' (Cologne Cathedral).
Die Berliner Mauer war ein Symbol des Kalten Krieges.
The Berlin Wall was a symbol of the Cold War.
Although the adjective is derived from the proper noun 'Rostock', it is written in lowercase when it comes before a noun.
Das ist eine typische rostocker Spezialität.
That is a typical Rostock specialty.