Where does “struha” come from?

struha (Czech) comes from Proto-Slavic struga, from Proto-Slavic strujiti, 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 “struha”, step by step

StepLanguageWordMeaning
1Proto-Slavicstrugawave front, current
2Proto-Slavicstrujitito gush out, to jet; to spawn, to boost
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 →