Xu Collection, Middle Volume. Radical: Face (miàn). Character: Dimple. Kangxi stroke count: 23. Page 1384, Entry 07.
Tang Rhyme (Tangyun) states: pronounced yan (falling tone). Collected Rhymes (Jiyun) and Rhyme Anthology (Yunhui) state: pronounced yan (falling tone).
Shuowen Jiezi states: the appearance of the face. Composed of the radical for face with the phonetic sound of yan.
Jade Chapters (Yupian) states: in the Huainanzi, chapter on Sayings of the Forest (Shuolin Xun), it is noted that dimples on the cheeks are considered beautiful. Note: the current version of the Huainanzi uses a different character. See the entry for that character for details.
Broad Rhymes (Guangyun) states: a dimple on the face.
Collected Rhymes (Jiyun) states: the cheek area.
Songs of Chu (Chuci), Great Summoning (Da Zhao) states: with dimples and fine teeth, smiling so charmingly.
Collected Rhymes (Jiyun) states: sometimes written in a simplified variant form.
Also, Collected Rhymes (Jiyun) states: pronounced yan (rising tone). A black spot on the face.
Another definition states: it is a mole.