Pronounced lang guo (falling tone) in "Tang Yun" and lu guo (falling tone) in "Ji Yun", with the same pronunciation as "luo" (falling tone). "Bo Ya" explains it as illness. "Shuowen Jiezi" explains it as an epidemic among livestock. Also pronounced lu guo (falling tone) in "Guang Yun" and lu wo (falling tone) in "Ji Yun", with a pronunciation similar to "luo" (departing tone). Also pronounced li wai (falling tone) in "Yu Pian" and lang wai (falling tone) in "Guang Yun" and "Ji Yun", with the same pronunciation as "lei" (falling tone). The meaning is the same.