a preoccupation with obscenity (especially that dealing with excrement or excretory functions)(medicine) the chemical analysis of excrement (for medical diagnosis or for paleontological purposes)
英汉双解大词典
scatology/skæˈtɒlədʒɪ/
1.
N（名词）
the scientific study of excrement, esp in medicine for diagnostic purposes, and in palaeontology of fossilized excrement 粪便学; 粪石学