Where does “lapidārius” come from?

lapidārius (Latin) comes from Latin lapis, from Proto-Italic *lapets.

Ancestry of “lapidārius”, step by step

Step	Language	Word	Meaning
1	Latin	lapis	a stone; a milestone; a boundary stone
2	Proto-Italic	*lapets	—

lapidārius — Etymology, Origin & Word History | Etymology Explorer