paschal lamb

noun
1.
Jewish History. a lamb slaughtered and eaten on the eve of the first day of Passover. Ex. 12:3–11.
2.
(initial capital letters) Christ.
3.
(initial capital letters) any of several symbolic representations of Christ, as the Agnus Dei.
4.
(initial capital letters). Also called Holy Lamb. Heraldry. a representation of a lamb passant having around its head a nimbus and supporting on the dexter shoulder a crosslike staff bearing a flag argent charged with a cross gules.
Origin
1400-50; late Middle English
British Dictionary definitions for paschal lamb

Paschal Lamb

noun
1.
(sometimes not capitals) (Old Testament) the lamb killed and eaten on the first day of the Passover
2.
Christ regarded as this sacrifice