Where does “грудьнь” come from?

грудьнь (Old East Slavic) comes from Proto-Slavic *grudьňь — December; November.

Ancestry of “грудьнь”, step by step

StepLanguageWordMeaning
1Proto-Slavic*grudьňьDecember; November

Words derived from “грудьнь

Every word from Proto-Slavic *grudьňь
грудьнь — Etymology, Origin & Word History | Etymology Explorer