Where does “ganglionnaire” come from?

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

ganglionnaire (French): ganglial

Definitions

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

ganglionnaire — Etymology, Origin & Word History | Etymology Explorer