satem

belonging to or consisting of those branches of the Indo-European family in which alveolar or palatal fricatives, as the sounds (s) or (sh), developed in ancient times from Proto-Indo-European palatal stops: the satem branches are Indo-Iranian, Armenian, Slavic, Baltic, and Albanian.

denoting or belonging to the group of Indo-European languages in which original velar stops became palatalized (k > s or / ʃ /). These languages belong to the Indic, Iranian, Armenian, Slavonic, Baltic, and Albanian branches and are traditionally regarded as the E group: Compare centum