"I am fully aware that it is a lingustic term but everybody and his mother knows it's now used as a catch all for ""the original aryan european of the Urheimat""  and it's frequently still used as anthropological term http://www.ancestrybydna.com/welcome/whatisancestrybydna/

Anyway this topic is very much off topic,the general gist of this wiki article is very good.

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