Relating to Belarus, its people, language, or culture; an older or variant spelling of 'Belarusian.'
From Russian 'Belorussiya' (Belarus), itself from 'belo-' (white) + 'Rus' (the medieval Slavic state), with the -ous suffix making it an adjective, though this spelling is archaic.
This older spelling shows how English once transliterated Russian names differently—modern 'Belarus' sounds more authentic to Belarusian speakers, so even country names evolve as English speakers become more culturally aware.
Complete word intelligence in one call. Free tier — 50 lookups/day.