Noun
Maslenitsa (usually uncountable, plural Maslenitsas)
An East Slavic festival of pre-Christian origin celebrated during the last week before Lent, seven weeks before Easter; analogous to Shrovetide.
Synonyms: Butter Week, Cheese Week
Russia main Boris Kustodiev's painting of Maslenitsa Maslenitsa ( Масленица main, also called Pancake Week or "Cheese Week") is a Russian folk holiday that incorporates some pagan traditions. Source: Internet