Chhiat-ūn

Wikipedia (chū-iû ê pek-kho-choân-su) beh kā lí kóng...
Qieyun excerpt in the Chinese Dictionary Museum, Jincheng, Shanxi
Tangyun excerpt in the Chinese Dictionary Museum
The first entry in the Qieyun

Chhiat-ūn (切韻) sī Tiong-kok siāng chá ê ūn-su.