Where does “pubescent” come from?

pubescent (Middle French) comes from Latin pubescens, from Latin pubesco, from Latin -ēscō, from Proto-Italic *-ēskō.

Ancestry of “pubescent”, step by step

Step	Language	Word	Meaning
1	Latin	pubescens	ripening; hairy
2	Latin	pubesco	I become pubescent; I ripen, mature
3	Latin	-ēscō	—
4	Proto-Italic	*-ēskō	—

pubescent — Etymology, Origin & Word History | Etymology Explorer