How do you say sister in Belarusian?
— сястра (f) (sjastrá)

Related synonyms for sister in Belarusian
babyдзіця (n) (dzicjá); немаўля (n) (nemaŭljá)
Generic synonyms for sister in Belarusian
girlдзяўчына (f) (dzjaŭčýna)
Antonyms for sister in Belarusian
brotherбрат (m) (brat)