Chen Collection, Lower Volume
Radical: Bad (dǎi)
Kangxi Strokes: 10
Page 580, Entry 12
Broad Rhymes (Guangyun), Collected Rhymes (Jiyun), Rhyme Compendium (Yunhui), Correct Rhymes (Zhengyun): Pronounced xu. An eggshell splitting. Book of Rites (Liji), Record of Music (Yueji): For those born from eggs, they do not split. Zheng Xuan commentary: Split. Kong Yingda sub-commentary: In the Qi region, local dialect refers to splitting as xu. Explanation of Text (Shiwen): An eggshell breaking and failing to hatch is called xu.
Also, Collected Rhymes (Jiyun): Pronounced yi. Book of Rites (Liji), Record of Music (Yueji): For those born from eggs, they do not split. This is the pronunciation by Fan Xuan.
Also, Collected Rhymes (Jiyun): Pronounced ji. Also pronounced xi. The meaning is the same.