Wei Collection, Lower Volume Radical: Meat (ròu) Fei Kangxi Strokes: 11 Page 978, Entry 06 Broad Rhymes (Guangyun): Pronounced ku (rising tone). The buttocks. Correction of Common Notions (Zhengzitong): According to popular usage, the part of the thigh near the opening is called the thigh pit. Refining Elegance (Boya): Fei, the leg. Explication of Texts (Shiwen): Pronounced du (rising tone). Also, according to Collection of Rhymes (Jiyun): Pronounced zhuo (falling tone). A knee ailment.