Meaning of Proto-Indo-European

Pro•to-In•do-Eu•ro•pe•an

Pronunciation: (prō'tō-in"dō-yoor"u-pē'un), [key]
— n.
  1. the unattested prehistoric parent language of the Indo-European languages; Indo-European.
—adj.
  1. of or pertaining to Proto-Indo-European.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.