Where does “samoistwo” come from?

samoistwo (Polish) comes from Polish samo-, from Polish -o-, from Old Polish -o-, from Proto-Slavic -o-.

Ancestry of “samoistwo”, step by step

StepLanguageWordMeaning
1Polishsamo-self-, auto-
2Polish-o-—
3Old Polish-o-—
4Proto-Slavic-o-—
Every word from Proto-Slavic -o- →Every word from Polish -o- →Every word from Polish samo- →