Where does “scatophagia” come from?

scatophagia (English) comes from English scato-, from Ancient Greek σκῶρ, from Proto-Hellenic skṓr, from Proto-Indo-European sḱṓr, from Proto-Indo-European sóḱr̥, from Proto-Indo-European -r̥ — Derives nouns from roots, frequently mass nouns.

Ancestry of “scatophagia”, step by step

StepLanguageWordMeaning
1Englishscato-excrement
2Ancient Greekσκῶρdung, excrement, feces
3Proto-Hellenicskṓr—
4Proto-Indo-Europeansḱṓr—
5Proto-Indo-Europeansóḱr̥dung, excrement
6Proto-Indo-European-r̥Derives nouns from roots, frequently mass nouns
Every word from Proto-Indo-European -r̥ →Every word from Proto-Indo-European sóḱr̥ →Every word from Proto-Indo-European sḱṓr →