Here are some possibilities to consider:
* Misspelling: It might be a misspelling of a real Russian word, like "мазохистский" (mazokhistic) or "мазохист" (masochist).
* Family Name: It could be a unique family name of Russian origin. Some Russian family names are formed from place names, occupations, or other unique characteristics.
* Foreign Origin: The name could be of foreign origin that has been adopted into Russian.
To determine the true meaning, more context is needed. For example:
* What is the source of this word? Was it found in a book, article, conversation, or other source?
* Is there any other information about the context? Does it relate to a person, a place, an event, or something else?
Knowing this additional information will help us better understand the meaning of "Mazoretzky".