slavonic, adj. & n.
1 of or relating to the group of Indo-European languages including Russian, Polish, and Czech.
2 of or relating to the Slavs.
--n. the Slavonic language-group.
Old Church Slavonic the earliest written Slavonic language, surviving as a liturgical language in the Orthodox Church.
med.L S(c)lavonicus f. S(c)lavonia country of Slavs f. Sclavus SLAV