берёза • (berjóza) f inan (genitive берёзы, nominative plural берёзы, genitive plural берёз)
From Old East Slavic береза (bereza), from Proto-Slavic *berza, from Proto-Balto-Slavic *berźas, *berźā, from Proto-Indo-European *bʰerHǵs, *bʰerHǵeh₂.