Where does “serocko” come from?

serocko (Polish) comes from Polish szeroko, from Polish -o, from Polish -a, from Old Polish -ą, from Proto-Slavic -a, from Proto-Indo-European -ōd.

Ancestry of “serocko”, step by step

StepLanguageWordMeaning
1Polishszerokowide, widely
2Polish-o-ly; ly
3Polish-aforms nominative feminine nouns
4Old Polish-ąforms third person plural of verbs
5Proto-Slavic-aid
6Proto-Indo-European-ōd—
Every word from Proto-Indo-European -ōd →Every word from Polish -o →Every word from Polish -a →