Ag·nus De·i (?g?n?s d????, än?yo?os d???, äg?no?os?)n.1. Christianity Lamb of God; Jesus. Also called Paschal Lamb.2. a. A liturgical prayer to Jesus.b. The last item of the Ordinary of the Roman Catholic Mass.c. A musical setting for either of these texts.[Late Latin Agnus De? : Latin agnus, lamb + Latin de?, genitive of deus, god.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Agnus Dei (?æ?n?s ?de??) n1. (Ecclesiastical Terms) the figure of a lamb bearing a cross or banner, emblematic of Christ2. (Ecclesiastical Terms) a chant beginning with these words or a translation of them, forming part of the Roman Catholic Mass or sung as an anthem in the Anglican liturgy3. (Roman Catholic Church) a wax medallion stamped with a lamb as emblem of Christ and blessed by the pope[Latin: Lamb of God]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Ag?nus De?i (?æg n?s ?di a?, ?d? i; ?? ny?s ?d? i) n. 1. a figure of a lamb as emblematic of Christ. 2. a prayer addressed to Christ preceding the communion in the Mass. [