This is the 16772nd most frequent Polish word.
wydały
"Wydały" means "they issued" or "they released."
In this context, 'wydały' is part of the reflexive verb 'wydały się,' meaning 'seemed.' It refers to the books and their appearance of interest.
Książki wydały się być bardzo interesujące.
The books seemed to be very interesting.
Here, 'wydały' means 'released' or 'published,' referring to what the publishing houses did.
Wydawnictwo wydały nową serię książek.
The publishing houses released a new book series.
In this sentence, 'wydały' is used in the sense of 'emitted' or 'gave out,' describing the flowers producing a scent.