This is the 7615th most frequent Russian word.
елеусинов
The word "елеусинов" is a proper noun, likely a surname in Russian, and does not have a standalone definition in English.
Here, 'Елеусинов' is utilized as a proper noun, most likely a surname referring to a person, emphasizing their significant achievement.
Елеусинов прекрасно выступил на турнире.
Eleusinov performed excellently at the tournament.
In this context, 'Елеусинов' is again a proper noun, used in a question to inquire about someone's knowledge of this individual.
Ты знаешь, кто такой Елеусинов?
Do you know who Eleusinov is?
Here, 'Елеусинов' is a name, representing the person who was interviewed, showcasing possession or involvement in the action described.