1. Agnus Dei. 2. A species of Vitex (V. agnus castus); the chaste tree. 3. A figure of a lamb bearing a cross or flag. 4. A cake of wax stamped with such a figure. It is made from the remains of the paschal candles and blessed by the Pope. 5. A triple prayer in the sacrifice of the Mass, beginning with the words "Agnus Dei."