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