續一切經音義 8.145

8.145

左腋（下之亦反玉篇云腋胳也亦脇下也又音亦從肉掖省聲）。

Left armpit (左腋: the second character is [pronounced with the] fanqie [initial and final of] 之 and 亦; the Yupian says that 'yè' means the armpit, and also below the ribs; it is also pronounced 'yì'; it takes the 'flesh' radical and the abbreviated phonetic 'yè').