This is the 17122nd most frequent Polish word.
włókienniczy
Relating to textiles or the textile industry.
Here, "włókienniczy" is used as an adjective to describe the type of factory, indicating it is related to textiles.
Zakład włókienniczy produkuje materiały wysokiej jakości.
The textile factory produces high-quality materials.
In this sentence, "włókienniczą" modifies "inżynierię" (engineering), specifying the field as related to textiles.
Studiuję inżynierię włókienniczą na uniwersytecie.
I am studying textile engineering at the university.
Here, "włókienniczy" qualifies "przemysł" (industry), denoting that the industry is associated with textile production.