This is the 482nd most frequent Hungarian word.
melyek
"Which (ones)"
In this sentence, 'melyek' is used as an interrogative pronoun to inquire about specific books.
Melyek azok a könyvek, amelyeket kölcsönkértél?
Which are those books that you borrowed?
Here, 'melyek' functions as an interrogative pronoun introducing a question about the most interesting options among the books.
A könyvek között, melyek a legérdekesebbek számodra?
Among the books, which ones are the most interesting to you?
In this example, 'melyek' is used as a relative pronoun to define and specify the antecedent noun 'események' with additional information.