Where does “стрела” come from?

стрела (Bulgarian) comes from Old Church Slavonic стрѣла, from Proto-Slavic strěla, from Proto-Indo-European strēl-, from Proto-Indo-European ster- — sterile, infertile.

стрела (Bulgarian): arrow

Definitions

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Ancestry of “стрела”, step by step

StepLanguageWordMeaning
1Old Church Slavonicстрѣлаarrow
2Proto-Slavicstrělaarrow
3Proto-Indo-Europeanstrēl-arrow
4Proto-Indo-Europeanster-sterile, infertile
Every word from Proto-Indo-European ster- →Every word from Proto-Indo-European strēl- →Every word from Proto-Slavic strěla →