Collection: Yin Collection, Middle Volume
Radical: Mountain (shān)
Page 15, Entry 12
In the Collection of Five Sounds and Rhymes (Wuyin Jiyun), it is noted as pronounced yan (dipping tone). The pronunciation is similar to the character yan. It means to be towering and steep.
Additionally, the Collected Rhymes (Jiyun) records that this character is the same as the character ying. For a detailed explanation, please refer to the annotation for the character ying.