Where does “olsak” come from?

olsak (Polish) comes from Polish Olsza, from Proto-Slavic olьxa, from Proto-Indo-European h₂éliseh₂, from Proto-Indo-European h₂élis-, from Proto-Indo-European el- — to bend; red, brown; hungry.

Ancestry of “olsak”, step by step

StepLanguageWordMeaning
1PolishOlszaalder, any tree of the genus Alnus
2Proto-Slavicolьxaalder
3Proto-Indo-Europeanh₂éliseh₂—
4Proto-Indo-Europeanh₂élis-alder
5Proto-Indo-Europeanel-to bend; red, brown; hungry
Every word from Proto-Indo-European el- →Every word from Proto-Indo-European h₂élis- →Every word from Proto-Indo-European h₂éliseh₂ →