Belarusian /ˌbɛləˈɹuːsi.ən/noun 2adjective 1forms 1 noun2 •A citizen of Belarus. •The Slavic language spoken in Belarus (formerly called White Ruthenia or White Russia). adjective1 •Of, from, or pertaining to Belarus, the Belarusian people.Polish MPs have approved a new measure which authorizes agents on the Belarusian border to fire live ammunition at migrants, for "self-defense" or in a "preventive manner." — 2024 formsBelarusians