Where does “četvьrtь” come from?

četvьrtь (Proto-Slavic) comes from Proto-Slavic četvьrtъ, from Proto-Balto-Slavic ketwirtas, from Proto-Indo-European *kʷetwr̥tós — fourth.

Ancestry of “četvьrtь”, step by step

StepLanguageWordMeaning
1Proto-Slavicčetvьrtъfourth
2Proto-Balto-Slavicketwirtasfourth
3Proto-Indo-European*kʷetwr̥tósfourth

Words derived from “četvьrtь”

Every word from Proto-Indo-European *kʷetwr̥tós →Every word from Proto-Balto-Slavic ketwirtas →Every word from Proto-Slavic četvьrtъ →