This is the 13432nd most frequent Polish word.
papieska
"Papieska" means "papal" or "related to the pope."
Here, "papieska" refers to something related to a pope, specifically describing the chapel belonging or dedicated to the pope.
Kaplica papieska jest dostępna dla zwiedzających.
The papal chapel is open to visitors.
In this context, "papieska" modifies "encyklika" to denote it as a document issued by a pope.
W encyklice papieskiej zawarte są ważne nauki kościoła.
The papal encyclical contains important teachings of the church.
Here, "papieska" specifies the audience as one conducted or hosted by the pope.