This is the 1530th most frequent Polish word.
artykułu
"Artykułu" is the genitive or accusative singular form of "artykuł," meaning "article" (as in a written piece or item).
In this sentence, 'artykułu' is in the genitive case, used to indicate possession or relation (here, the fragment belongs to the article).
Przeczytałem interesujący fragment artykułu.
I read an interesting excerpt of the article.
Here, 'artykułu' is again in the genitive case, related to 'tego' to specify the article being referred to (this article).
Czy znasz autora tego artykułu?
Do you know the author of this article?
In this context, 'artykułu' is in the genitive case, which is required after the expression 'treścią' when referring to the content of the article.