Unknown PIE root

Fragment of a discussion from User talk:Rua

That makes sense. I suppose the area using uvular trills got the phone from a common source. I've always assumed that Danish got it from German and its close relatives, and that languages like Pre-French used alveolar trills. Could it have possibly been from a non-Indo-European substratum (although it's a long shot)?

Jackwolfroven (talk)00:12, 19 January 2013