Hai Collection, Lower Volume Radical: Tooth (chǐ) Yu (yǔ) Page 1534, Entry 22 Pronounced yu (rising tone). In the Shuo Wen Jie Zi (Explaining Graphs and Analyzing Characters), it states: teeth that do not meet. In the Zi Hui (Collection of Characters), it states: one forward and one backward, teeth that are uneven and do not meet. In the Tai Xuan Jing (Great Mystery Canon) by Yang Zi, it states: his will is discordant. Also pronounced yu. Also pronounced wu. The meaning is the same. Also pronounced e (rising tone) as a rhyme. Yan-yu, the shape of mountains. In the Western Capital Rhapsody (Xijing Fu) by Zhang Heng, it states: Arranging the Yingzhou and Fangzhang islands, flanking the Penglai island in rows. Above are mountain peaks piled high, below are crags and ridges that are uneven.