Wu Collection, Upper Volume Radical: Jade (yù) Xiu Kangxi strokes: 11 Page 730, Entry 23 Tang Rhymes (Tangyun) and Collected Rhymes (Jiyun) state the pronunciation is xiu (falling tone). Explaining Characters (Shuowen) states: decayed jade. Also, Collected Rhymes (Jiyun) states the pronunciation is xu. The meaning is the same.