Where does “retrogradior” come from?

retrogradior (Latin) comes from Latin retrō, from Latin dūcere, from Proto-Italic doukō, from Proto-Indo-European déwketi, from Proto-Indo-European dewk- — to pull, to draw; to lead.

retrogradior (Latin): I go or step back or backwards, retrograde

Definitions

I go or step back or backwards, retrograde

Ancestry of “retrogradior”, step by step

retrogradior traces back through two separate lines of ancestry.

via Latin retrō

Step	Language	Word	Meaning
1	Latin	retrō	back, backwards, behind
2	Latin	dūcere	—
3	Proto-Italic	doukō	lead
4	Proto-Indo-European	déwketi	—
5	Proto-Indo-European	dewk-	to pull, to draw; to lead

via Latin gradior

Step	Language	Word	Meaning
1	Latin	gradior	I step, walk; I advance, go
2	Latin	gradus	a step, pace; a stage, degree; a rank
3	Proto-Italic	graðus	—
4	Proto-Indo-European	gʰradʰ-	—

Words derived from “retrogradior”

Every word from Proto-Indo-European dewk- →Every word from Proto-Indo-European déwketi →Every word from Proto-Italic doukō →