Where does “òst” come from?

òst (Old Occitan) comes from Latin hostem, from Proto-Italic hostis, from Proto-Indo-European gʰóstis, from Proto-Indo-European -tis — Derives abstract/action nouns from verb roots.

Ancestry of “òst”, step by step

Step	Language	Word	Meaning
1	Latin	hostem	accusative singular of hostis
2	Proto-Italic	hostis	stranger, guest
3	Proto-Indo-European	gʰóstis	stranger, host
4	Proto-Indo-European	-tis	Derives abstract/action nouns from verb roots

Every word from Proto-Indo-European -tis →Every word from Proto-Indo-European gʰóstis →Every word from Proto-Italic hostis →