This is the 9997th most frequent Russian word.
арабской
The Russian word "арабской" means "Arab" or "Arabic" in English, used as a feminine singular or genitive case form.
In this sentence, 'арабской' is in the prepositional case (feminine singular) agreeing in gender, number, and case with the noun 'культуре'.
Я читал книгу об арабской культуре.
I read a book about Arabic culture.
Here, 'арабской' is in the dative case (feminine singular) modifying 'стране' to indicate to whom the help is needed.
Арабской стране нужна помощь.
An Arabic country needs help.
In this context, 'арабской' is used in the genitive case (feminine singular) showing possession or relation to 'каллиграфии'.