Refers to the city of Erfurt in Thuringia; originating from Erfurt or belonging to Erfurt. It is an indeclinable adjective derived from the name of a city.
example
Die Erfurter Puffbohne ist eine lokale Spezialität.
The Erfurt broad bean is a local specialty.
Usage tips
No declension
Adjectives that are derived from the name of a city and end in '-er' are not declined. The form 'erfurter' (Erfurt) therefore always stays the same, no matter what gender, case, or number the noun has.
EXAMPLE
Der Erfurter Dom ist ein beeindruckendes Bauwerk.
Erfurt Cathedral is an impressive building.
Derived from city names
This adjective is formed by adding the ending '-er' to the name of the city Erfurt. This pattern is very common in German for expressing that something belongs to a city.
EXAMPLE
Die Ausstellung zeigt Werke Erfurter Künstler.
The exhibition shows works by Erfurt artists.
Always capitalized
Because 'erfurter' (Erfurt) is derived from the proper noun 'Erfurt,' it is always capitalized, even when it stands before a noun like a normal adjective.