Where does “*ale si” come from?

*ale si (Vulgar Latin) comes from Latin alius, from Proto-Italic aljos, from Proto-Indo-European h₂élyos, from Proto-Indo-European h₂él- — to grow, nourish.

Ancestry of “*ale si”, step by step

StepLanguageWordMeaning
1Latinaliusother, another, any other; else; different
2Proto-Italicaljosanother
3Proto-Indo-Europeanh₂élyosother, another
4Proto-Indo-Europeanh₂él-to grow, nourish
Every word from Proto-Indo-European h₂él- →Every word from Proto-Indo-European h₂élyos →Every word from Proto-Italic aljos →