Where does “alluvionnaire” come from?

alluvionnaire (French) comes from French -aire, from Latin -ārius, from Proto-Italic *-āzios.

alluvionnaire (French): alluvial

Definitions

Step	Language	Word	Meaning
1	French	-aire	-ary; -aire
2	Latin	-ārius	—
3	Proto-Italic	*-āzios	—

alluvionnaire — Etymology, Origin & Word History | Etymology Explorer