This is the 747th most frequent Romanian word.
muzeul
"The museum."
In this sentence, 'muzeul' is the direct object of the verb 'am vizitat' (I visited) and refers to the specific museum in question.
Am vizitat muzeul de artă din oraș.
I visited the art museum in the city.
In this instance, 'muzeul' is part of a prepositional phrase and indicates the specific museum of history being mentioned.
Ne-am întâlnit cu ghidul la intrarea în muzeul de istorie.
We met with the guide at the entrance to the history museum.
Here, 'muzeul' is the subject of the verb 'a fost' (was) and represents a particular institution called the museum.