This is the 7560th most frequent German word.
greifswalder
"Greifswalder" refers to something or someone from or related to the city of Greifswald in Germany.
The word 'Greifswalder' is used as an adjective derived from the name of the city 'Greifswald' to describe something associated with it, in this case, the university.
Die Greifswalder Universität ist berühmt für ihre Forschung.
The University of Greifswald is famous for its research.
Here 'Greifswalder' functions as a substantivized adjective, referring to a person from the city of Greifswald.
Ich habe einen Greifswalder getroffen, der interessante Geschichten erzählt hat.
I met a person from Greifswald who told interesting stories.
In this usage, 'Greifswalder' is again an adjective, describing the weather as characteristic of the region.