This is the 8676th most frequent Polish word.
radziechowska
"Radziechowska" refers to something or someone originating from or associated with Radziechowy, a village in Poland.
The word 'Radziechowska' here is used as a proper noun, being the name of a street.
Anna mieszka na ulicy Radziechowska.
Anna lives on Radziechowska street.
In this case, 'Radziechowska' is used as a proper noun referring to the name of a village.
Czytałem książkę o historii wsi Radziechowska.
I read a book about the history of the village Radziechowska.
'Radziechowska' acts as an adjective derived from a proper noun, used to describe the traditions originating from a place called Radziechowska.