This is the 8225th most frequent Turkish word.
mescidi
A small mosque or prayer room.
In this sentence, 'mescidi' is the accusative case of the noun 'mescit' (mosque), indicating the object of the action.
Mescidi ziyaret etmek için sabırsızlanıyorum.
I am eager to visit the mosque.
Here, 'mescidi' is used to specify a particular mosque, functioning again in the accusative case to show it as the thing being seen.
Şehirde bulunan tarihi mescidi görmek çok güzel bir deneyimdi.
Visiting the historic mosque in the city was a very nice experience.
In this case, 'mescidi' serves as the direct object of the verb 'süslemek' (to decorate), specifying the noun that is affected by the action.