Mao Collection, Upper Volume. Radical: Heart (xīn). Kangxi stroke count: 17. Page 405, Entry 12. Correct Rhymes (Zhengyun) records the pronunciation as dong (falling tone), same as the character dong. Mengdong refers to a state of internal confusion or lack of clarity. According to the Extensive Dictionary of Rhymes (Guangyun) and the Collected Rhymes (Jiyun), only the character containing the original radical form is listed, while this character is absent. The Correct Rhymes (Zhengyun) included this character for the sake of simplicity but omitted the original form, whereas the Collection of Characters (Zihui) included both. This is an error resulting from the transcription of character shapes and stroke counts over time, which has led to an unnecessary proliferation of the number of Chinese characters.