Meaning of らいいん in Japanese

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Definition of らいいん

らいいん(raiin) 【来院】

少しすこし戻ってみたらいいんじゃない。

We'd better go back a little.

教科書きょうかしょはどうしたらいいんでしょうか。

Where do we get the textbooks?

もう一度もういちど若くなれたらいいんだが。

Would that I were young again.

I wish this job was over.

I'd love to be able to wear a dress like that. But I'll have to lose some weight first.