This is the 8480th most frequent Russian word.
немецкое
The Russian word "немецкое" means "German" (adjective, neuter form).
Here, 'немецком' (a form of 'немецкое') is used as an adjective to describe the language in which the book is written, specifying 'German'.
Эта книга написана на немецком языке.
This book is written in German.
Here, 'немецкое' is used as an adjective to describe a car, indicating its origin or characteristic as 'German'.
Я купил немецкое авто.
I bought a German car.
Here, 'немецкое' is used as an adjective to detail the type of traditional dish being referenced, specifically one from Germany.