Where does “крилце” come from?

крилце (Bulgarian) comes from Bulgarian крило, from Proto-Slavic kridlo, from Proto-Slavic -dlo, from Proto-Indo-European -dʰlom — Alternative form of *-trom; instrumental suffix;...

Ancestry of “крилце”, step by step

StepLanguageWordMeaning
1Bulgarianкрилоwing, pinion; wing; protection, care
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 →