Where does “криля” come from?

криля (Ukrainian) comes from Ukrainian крило́, from Proto-Slavic kridlo, from Proto-Slavic -dlo, from Proto-Indo-European -dʰlom — Alternative form of *-trom; instrumental suffix;...

Ancestry of “криля”, step by step

StepLanguageWordMeaning
1Ukrainianкрило́wing
2Proto-Slavickridlowing
3Proto-Slavic-dloForms nouns denoting a tool or instrument
4Proto-Indo-European-dʰlomAlternative form of *-trom; instrumental suffix;...
Every word from Proto-Indo-European -dʰlom →Every word from Proto-Slavic -dlo →Every word from Proto-Slavic kridlo →