Did you mean Belarusian?
Belarusian
adjective
°Of, from, or pertaining to Belarus, the Belarusian people or the Belarusian language.
noun
°The Slavic language spoken in Belarus (formerly called White Russia).
°A person from Belarus or of Belarusian descent.
synonyms: belarusan, belarussian, belorussian, bielorussian more» , byelorussian, white russian, white ruthenian