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...Even after getting married, they return to their parents' homes and continue to participate in ceremonies. The honorific form of Onari, Uminaibi, means the daughter of a king, and it is possible that Onari was a word referring to the younger generation. In western Japan, women who prepare meals, such as during rice planting season, are called Onari, but Onari-gami also tend to be associated with those who handle offerings.

*Some of the terminology that mentions "Uminaibi" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…嫁した後も実家に帰って行事にたずさわるところに特色がある。オナリの敬称形ウミナイビは王の娘を意味し，オナリが娘世代を指す語であった可能性もある。西日本では，田植どきなど，食事の用意をする女性をオナリと呼ぶが，オナリ神も供物の取扱者の色彩が強い。…

※「ウミナイビ」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報