noun
mochi for a child's 50th day celebration
Traditional Japanese custom; mochi (rice cake) prepared for the 五十日の祝 (ikanoka no iwai), a celebration held on a baby's 50th day after birth.
See also: 五十日の祝
五十日の餅は、赤ちゃんの健やかな成長を願って作られます。
The 50th-day mochi is made to wish for the baby's healthy growth.
五十日の祝 refers to the celebration itself, while 五十日の餅 is the specific mochi used in that celebration.
Compound of 五十日 (ikanoka, 'fiftieth day') and 餅 (mochi, 'rice cake'). The reading いか is an older form of 五十 (fifty).