Wu Collection, Lower Volume Radical: Stone (shí) Kangxi strokes: 16 Page 835, Entry 18 Broad Rhymes (Guangyun) and Collected Rhymes (Jiyun): Pronounced liu (falling tone). Correct Meaning Thoroughly Explained (Zhengzitong): A stone roller. An agricultural tool for leveling fields. Also written in a variant form (dú). Also from Collected Rhymes (Jiyun): Pronounced lu (falling tone). The meaning is the same.