While Agnus Dei refers to Christ, it actually means "lamb of" this
- Catholic Straight Answers [PAR] To understand why the title Lamb of God is used for Christ, we must first ... For 
this reason, the Agnus Dei is sung during the fraction, the breaking of the... [DOC] [TLE] Agnus Dei - definition of Agnus Dei by The Free Dictionary [PAR] Define Agnus Dei.