noun
third-night rice-cake ceremony
A Heian-period wedding custom where the bride and groom ate rice cakes together on the third night after the wedding. Also referred to as 三日の餅. Historical term; not part of modern wedding practices.
See also: 三日の餅
三日夜の餅は、平安時代の婚礼の儀式の一つである。
The third-night rice-cake ceremony was one of the wedding rituals of the Heian period.
Synonymous term for the same ceremony; 三日夜の餅 is the fuller form.
From 三日 (third day) + 夜 (night) + の (possessive particle) + 餅 (rice cake). The exact historical origin of the custom is uncertain.