Where does “*rāsōria” come from?

*rāsōria (Vulgar Latin) comes from Latin rāsōrium, from Latin -torium, from Latin -tōrius, from Latin -tor, from Proto-Italic -tōr, from Proto-Indo-European -tōr, from Proto-Indo-European -tor-s.

Ancestry of “*rāsōria”, step by step

Step	Language	Word	Meaning
1	Latin	rāsōrium	razor
2	Latin	-torium	nominative neuter singular of -tōrius; accusative...
3	Latin	-tōrius	ory
4	Latin	-tor	-er
5	Proto-Italic	-tōr	Forms agent nouns to verb stems
6	Proto-Indo-European	-tōr	Derives agent nouns from verbs, denoting someone...
7	Proto-Indo-European	-tor-s	—

Every word from Proto-Indo-European -tor-s →Every word from Latin -torium →Every word from Latin -tor →