Where does “alsus” come from?

alsus (Latin) comes from Latin -us, from Old Latin -os, from Proto-Italic -os, from Proto-Indo-European -ós — Creates agent nouns from verb stems, denoting...

Ancestry of “alsus”, step by step

Step	Language	Word	Meaning
1	Latin	-us	suffix forming adjectives from nouns, verbs,...
2	Old Latin	-os	accusative masculine plural of -us
3	Proto-Italic	-os	—
4	Proto-Indo-European	-ós	Creates agent nouns from verb stems, denoting...

Every word from Proto-Indo-European -ós →Every word from Latin -us →Every word from Old Latin -os →