Where does “струйка” come from?

струйка (Russian) comes from Russian струя, from Old East Slavic струя, from Proto-Slavic struja, from Proto-Balto-Slavic sraujāˀ, from Proto-Indo-European srew-, from Proto-Indo-European ser- — to flow; to guard; to bind, to tie together.

Ancestry of “струйка”, step by step

StepLanguageWordMeaning
1Russianструяjet, air blast; spurt, squirt, stream; current,...
2Old East Slavicструя—
3Proto-Slavicstrujastream
4Proto-Balto-Slavicsraujāˀstream, current
5Proto-Indo-Europeansrew-to flow, stream
6Proto-Indo-Europeanser-to flow; to guard; to bind, to tie together
Every word from Proto-Indo-European ser- →Every word from Proto-Indo-European srew- →Every word from Proto-Balto-Slavic sraujāˀ →