Where does “fricativus” come from?

fricativus (New Latin) comes from Latin fricō, from Latin frio, from Proto-Italic *friāō.

Ancestry of “fricativus”, step by step

Step	Language	Word	Meaning
1	Latin	fricō	—
2	Latin	frio	I crumble, rub, or break into pieces
3	Proto-Italic	*friāō	—

fricativus — Etymology, Origin & Word History | Etymology Explorer