Satem

adjective

1. Designating those Indo-European languages, including the Indo-Iranian, Armenian, and Balto-Slavic branches, in which original palatal velar stops became fricatives (as k' > s or š) and labiovelar stops became plain velars (as kw > k).
2. referring to a Proto-Indo-European language group that produced sibilants from a series of palatovelar stops.