Where does “płetwonurek” come from?
płetwonurek (Polish) comes from Polish płetwa, from Old Polish plutwa, from Old Czech plútva, from Old Czech plúti, from Proto-Slavic pluti, from Proto-Balto-Slavic plauˀtei, from Proto-Indo-European pleh₃(w)- — to swim, flow.
płetwonurek (Polish): scuba diver, frogman
Ancestry of “płetwonurek”, step by step