Where does “lesisko” come from?

lesisko (Polish) comes from Polish las, from Old Polish las, from Proto-Slavic *lě̑sъ — forest, woods.

Ancestry of “lesisko”, step by step

StepLanguageWordMeaning
1Polishlasforest
2Old Polishlasforest, woods
3Proto-Slavic*lě̑sъforest, woods
Every word from Proto-Slavic *lě̑sъ