Chen Collection, Middle Volume Radical: Tree (mù) 柢 Kangxi strokes: 9 Page 520, Entry 04 Pronounced di (rising tone). According to the Explaining Graphs and Analyzing Characters (Shuowen Jiezi), it refers to a root. Xu Kai says: the root of a flower or leaf is called ti, while the root of a tree is called di. As mentioned in the Dao De Jing by Laozi: A deep root and a firm base (di). In the Immortals Wandering Poetry (Youxian Shi) by He Shao: The root and base do not wither or fall. It is also interchangeable with di. As stated in the Er Ya: An official residence (di) is written as di. Guo Pu notes: The root (di) and the base (di) both refer to the bottom of an object; di is the base. Also, pronounced di (falling tone). Also, pronounced di (level tone). The meanings are the same.