續一切經音義 1.158

1.158

犛牛（上昴包反山海經云潘侯之山有獸狀如牛而四節生毛名曰犛牛郭璞注云牛背膝胡尾皆長毛也說文西南夷長髦牛也字從敕牛教力之反胡臆前項下）。

犛牛 [yak] (The upper character is pronounced with the fanqie 昴包 [máo]. The Classic of Mountains and Seas says: “On Mount Panhou there is a beast shaped like an ox, with hair growing on its four legs, called a máoniú [yak].” Guo Pu's commentary says: “Its back, knees, dewlap, and tail all have long hair.” The Shuowen jiezi says: “A long-haired ox of the southwestern barbarians; the character is formed from 敕 and 牛 [ox].” The pronunciation of 敕 is the fanqie 力之 [lí]. The 'dewlap' (胡) refers to the underside of the neck in front of the chest).