Ag'nus De'i, a term applied to Christ in John 1, 29, and in the Catholic liturgy a prayer beginning with the words "Agnus Dei," generally sung before the communion. The term is also commonly given to a medal, or more frequently a cake of wax, consecrated by the pope and stamped with the figure of a lamb supporting the banner of the cross. These medals are distributed to the faithful the first Sunday after Easter. In the Greek Church, Agnus Dei is a cloth bearing an image of a lamb. It is used to cover the cup in the communion service.