Li Shizhen
"Dilong" first means "earthworm" in the "Qixiu Leigao" written by the Ming dynasty scholar Lang Ying (1487–1566 CE). The 1578 Bencao Gangmu pharmacological entry for "qiuyin" "earthworm" lists alternate names of "dilong" and "tulong" (see above). Li Shizhen notes these names derive from the myth that earthworms (like dragons) can create "yinqing" "cloudy and clear; unsettled weather".