pedology
n.
"scientific study of the soil," 1924, from Greek pedon "ground, earth," from PIE root *ped- (see foot, n.) + -logy. Related: Pedological. Earlier it was a word for "the study of children" (1894), from pedo-.
〔李〕n.儿科学 [-logy=the science of] ←ped（o）-[GK] =child儿童
〔蒋〕[ped儿童，-o-，-logy…学] 儿科学