Hai Collection, Lower Volume Radical: Tooth (chǐ) Entry: Yú Kangxi Stroke Count: 21 Page 1534, Entry 05 Pronounced jiù According to the Explaining Graphs and Analyzing Characters (Shuowen Jiezi), it refers to the teeth of an elderly person resembling mortars. Another source states it refers to the teeth of an eight-year-old horse resembling mortars.