Where does “ра́к” come from?

ра́к (Russian) comes from Proto-Slavic rakъ, from Proto-Balto-Slavic rṓˀkas, from Proto-Indo-European wreh₃kʷos — looking backwards.

Ancestry of “ра́к”, step by step

StepLanguageWordMeaning
1Proto-Slavicrakъcrayfish
2Proto-Balto-Slavicrṓˀkas—
3Proto-Indo-Europeanwreh₃kʷoslooking backwards

Words derived from “ра́к”

Every word from Proto-Indo-European wreh₃kʷos →Every word from Proto-Balto-Slavic rṓˀkas →Every word from Proto-Slavic rakъ →