Definition of 「禴」:
1. Ancient character same as "礿".
2. Noun: The name of a sacrificial ceremony in ancient ancestral temples. During the Xia and Shang dynasties, it was a spring sacrifice, whereas in the Zhou dynasty it was renamed as a summer sacrifice. Same as "礿".
Example from the Book of Songs, Lesser雅, "The 禴 altar's summer offering, to the Duke and our ancestors."
Han dynasty scholar Mao Heng's commentary: "In spring it is called a sacrifice, in summer it is 禴, in autumn it is tasting, and in winter it is 烝."
3. Noun: The name of a sacrificial ceremony in ancient ancestral temples. During the Xia and Shang dynasties, it was a spring sacrifice, whereas in the Zhou dynasty it was renamed as a summer sacrifice. Same as "礿".
Example from the Book of Songs, Lesser雅, "The 禴 altar's summer offering, to the Duke and our ancestors."
Han dynasty scholar Mao Heng's commentary: "In spring it is called a sacrifice, in summer it is 禴, in autumn it is tasting, and in winter it is 烝."