This is the 10880th most frequent Swedish word.
litauisk
Lithuanian.
Here 'litauisk' is used as an adjective to describe the origin of the book as being Lithuanian.
Jag köpte en litauisk bok på bokhandeln.
I bought a Lithuanian book at the bookstore.
In this sentence, 'litauisk' describes the type of the dish, indicating that it belongs to Lithuanian cuisine.
Hon lagade en litauisk maträtt till middagen.
She cooked a Lithuanian dish for dinner.
Here 'litauisk' serves as an adjective to indicate the nationality of the friend, meaning that they are from Lithuania.