Where does “kateringowy” come from?

kateringowy (Polish) comes from Polish -owy, from Old Polish -owy, from Proto-Slavic -ovъ — of, belonging to.

Ancestry of “kateringowy”, step by step

StepLanguageWordMeaning
1Polish-owy-y
2Old Polish-owyappended to nouns to form adjectives; -y
3Proto-Slavic-ovъof, belonging to
Every word from Proto-Slavic -ovъ →Every word from Polish -owy →Every word from Old Polish -owy →