Balto-Slavic in American English
(ˈbɔltoʊˈslɑvɪk; ˈbɔltoʊˈslævɪk)
noun1. the Baltic and Slavic languages, when considered as constituting a subfamily within the Indo-European family of languages: the Baltic and Slavic branches are now generally considered by scholars as independently derived from Indo-European
adjective2. designating or of such a language subfamily