Where does “pétrologie” come from?

pétrologie (French) comes from French -logie, from Latin -logia, from Ancient Greek -λογῐ́ᾱ.

pétrologie (French): petrology

Definitions

Step	Language	Word	Meaning
1	French	-logie	-logy
2	Latin	-logia	-logy; the study of
3	Ancient Greek	-λογῐ́ᾱ	—

pétrologie — Etymology, Origin & Word History | Etymology Explorer