This is the 8636th most frequent Russian word.
острожского
The word "острожского" means "of Ostroh" or "related to Ostroh," referring to the town Ostroh in Ukraine.
In this sentence, 'острожского' refers to something pertaining to Ostroh, used as an adjective to define the edition of books.
Книги острошского издания являются одними из самых редких.
Books of the Ostroh edition are among the rarest.
Here, 'острожского' characterizes the artistic interior using a stylistic term referring to Ostroh.
Старинный монастырь показал удивительное острожского искусства убранство.
The ancient monastery showcased an amazing Ostroh-style artistic interior.
In this sentence, 'острожского' is used as an adjective defining the cultural heritage, attributing it to Ostroh.