/byel'oh rush"euhn, bel'oh-/ , adj.
1. of or pertaining to Byelorussia, its people, or their language.
n.
2. a native or inhabitant of Byelorussia.
3. an East Slavic language, spoken by the inhabitants of Byelorussia and written in the Cyrillic alphabet. Cf. Slavic (def. 1).
Also, Belorussian .
[ BYELORUSSI(A) + -AN ]