一切經音義 1.105

1.105

臍中（情奚反字書云當腹之中曰臍說文膍臍也從肉齊聲也或下從肉亦同膍音毘）。

Qizhong (middle of the navel) (qing-xi fan; the character dictionary says: "What is in the middle of the abdomen is called qi"; the Shuowen says: "Piqi; derived from 肉 with 齊 as phonetic"; it is also written with 肉 underneath, which is identical; pi is pronounced pi).