Where does “ossär” come from?

ossär (German) comes from German -är, from French -aire, from Latin -ārius, from Proto-Italic *-āzios.

ossär (German): osseous, ossal

Definitions

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

ossär — Etymology, Origin & Word History | Etymology Explorer