Definition: MRCBSU is a Greek word that means "The Lord's Supper." It refers to the main meal or feast at the Christian church, typically consisting of unleavened bread, wine, fruit, and unleavened cakes called cakes of bread. The term "mrcbsu" comes from the Greek word for "bread" (m), "leaven" (r), and "cup" (c). It is a religious feast celebrated on the Lord's Day during Lent, typically observed in April or May.