お菜さいおさいMeanings1nounside dishpolite (teineigo)Polite term for a side dish, often used in the context of a traditional Japanese meal. The plain form is 菜 (さい).See also: 菜今日きょうのお菜さいは何なんですか。What is today's side dish?お菜さいをもう少すこし召めし上あがりますか。Would you like some more of the side dish?