One of a primitive people supposed to have lived in
   prehistoric times, in Central Asia, east of the Caspian Sea, and north
   of the Hindoo Koosh and Paropamisan Mountains, and to have been the
   stock from which sprang the Hindoo, Persian, Greek, Latin, Celtic,
   Teutonic, Slavonic, and other races; one of that ethnological division
   of mankind called also Indo-European or Indo-Germanic.