Hai Collection, Upper Volume Radical: Bone (gǔ) 骶 Kangxi strokes: 15 Page 1448, Entry 42 Broad Rhymes (Guangyun): Pronounced di (falling tone) Collected Rhymes (Jiyun): Pronounced di (falling tone), same pronunciation as di. Refined Conversations (Boya): Defined as the back part, referred to as the sacrum. Jade Chapters (Yupian): Defined as the buttocks. Collected Rhymes (Jiyun): Pronounced di (rising tone), same pronunciation as di. Meaning is identical.