[ proh-toh-in-doh-yoo r-uh-pee-uh n ]
/ ˈproʊ toʊˌɪn doʊˌyʊər əˈpi ən /
the unattested prehistoric parent language of the Indo-European languages; Indo-European.
of or relating to Proto-Indo-European.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for proto-indo-european
the prehistoric unrecorded language that was the ancestor of all Indo-European languages
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012