Xu Collection, Middle Volume Radical: Rain (yǔ) 靅 Kangxi strokes: 24 Page 1380, Entry 19 Broad Rimes (Guangyun) and Collected Rimes (Jiyun) state the pronunciation is fei (falling tone). Jade Chapters (Yupian) defines it as the appearance of clouds. Broad Rimes (Guangyun) records the term ai-fei, meaning clouds densely covered. Collected Rimes (Jiyun) mentions that this character also has other variant forms. Additionally, Collected Rimes (Jiyun) states the pronunciation is pei (falling tone). The term ai-fei describes thick and abundant clouds.