Where does “filial” come from?

filial (Romanian) comes from French filial, from Latin fīliālis, from Latin fīlius, from Old Latin fīlios, from Proto-Indo-European dʰeh₁y-li-os, from Proto-Indo-European dʰeh₁(y)- — to suckle, nurse.

filial (Romanian): filial

Definitions

filial

Ancestry of “filial”, step by step

Step	Language	Word	Meaning
1	French	filial	Characteristic of or befitting the relationship...
2	Latin	fīliālis	Filial; of or pertaining to a son or daughter
3	Latin	fīlius	a son
4	Old Latin	fīlios	—
5	Proto-Indo-European	dʰeh₁y-li-os	sucker
6	Proto-Indo-European	dʰeh₁(y)-	to suckle, nurse

Every word from Proto-Indo-European dʰeh₁(y)- →Every word from Proto-Indo-European dʰeh₁y-li-os →Every word from Old Latin fīlios →