說文

see 說文解字|说文解字[Shuo1 wen2 Jie3 zi4]

language / culture / writing / formal / literary / gentle / (old) classifier for coins / Kangxi radical 67

to persuade

to speak / to say / to explain / to scold / to tell off / a theory (typically the last character in a compound, as in 日心說|日心说 heliocentric theory)

to speak; to talk; to say / to explain; to comment / to scold; to tell off / (bound form) theory; doctrine

Shuowen Jiezi, the original Han dynasty Chinese character dictionary with 10,516 entries, authored by Xu Shen 許慎|许慎[Xu3 Shen4] in 2nd century

Commentary on Shuowen Jiezi (1815) by Duan Yucai 段玉裁[Duan4 Yu4 cai2]