Tang Rhymes (Tangyun) and Collected Rhymes (Jiyun) state it is pronounced rui (falling tone). It is the same pronunciation as cui (falling tone). It means a small wound. Additionally, Collected Rhymes (Jiyun) states it is pronounced rui (falling tone). It is the same pronunciation as rui (falling tone). It means a sharp edge. Additionally, Jade Chapters (Yupian) records it as a seal script form of the character rui (falling tone).