Where does “głuchoniema” come from?

głuchoniema (Polish) comes from Polish głuchoniemy, from Polish -o-, from Old Polish -o-, from Proto-Slavic -o-.

Ancestry of “głuchoniema”, step by step

StepLanguageWordMeaning
1Polishgłuchoniemydeaf-mute, deaf and dumb; deaf-mute person
2Polish-o-—
3Old Polish-o-—
4Proto-Slavic-o-—
Every word from Proto-Slavic -o- →Every word from Polish -o- →Every word from Old Polish -o- →