一切經音義 9.177

9.177

肋骨（郎得反說文脅骨也字從肉經文從革作勒馬頭絡銜者也）。

Rib bones (肋骨; fanqie l- [郎] + -d- [得]; Shuowen: "Flank bones"; the character is derived from the flesh radical; sūtra texts write it with the leather radical as le (勒), which is the bridle on a horse's head).