Pronounced yu lu (falling tone) according to Guangyun (Guangyun) and yi lu (falling tone) according to Jiyun (Jiyun), same pronunciation as "yu". Yúpiàn (Yupian) explains it as the stomach of a bird. Jiyun (Jiyun) explains it as the gizzard and stomach of a bird. Shiming (Shiming) explains: "䐿" means "ao" (ao). It refers to hiding things deep inside, and taking them out slightly when needed. Also, pronounced wu dao (falling tone) according to Guangyun (Guangyun) and yu dao (falling tone) according to Jiyun (Jiyun), same pronunciation as "ao" (ao). The meaning is the same. Also, pronounced wu hao (rising tone) according to Guangyun (Guangyun) and wu hao (rising tone) according to Jiyun (Jiyun), same pronunciation as "ao" (ao). Jiyun (Jiyun) explains it as bone. The original character is written as "䯠". Also, the original character is written as "奥" (ao). The "Book of Rites (Liji), Neize" records "鴇奥鹿胃". The commentary states: "鴇奥" refers to the spleen.