Heisuiin

Japanese: 平水韻 - へいすいいん

〘Noun〙 The name of the classification of rhymes used as a standard for poetry in China after the Ming and Qing dynasties. The classification of 206 rhymes in the traditional "Guangyun" was too detailed, so it gradually came to be used for all purposes. In the 12th year of the Chunyou era of the Song dynasty ( 1252 ), Liu Yuan, a man from Pingshui, Jiangbei (Limphen City, Shanxi Province), summarized it into 107 rhymes. It was later further revised to 106 rhymes in the Yuan dynasty.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙中国で明・清以降、作詩の基準として用いられた韻分類の呼称。従来の「広韻」の二〇六の韻目の類別が細かすぎるため、次第に同用されるようになっていたのを、宋の淳祐一二年（一二五二）、江北平水（山西省臨汾市）の人劉淵がまとめて一〇七韻としたもの。のち元代にさらに修正されて一〇六となった。

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