Proto-Indo-European
[ proh-toh-in-doh-yoo r-uh-pee-uh n ]
/ ˈproʊ toʊˌɪn doʊˌyʊər əˈpi ən /
noun
the unattested prehistoric parent language of the Indo-European languages; Indo-European.
adjective
of or relating to Proto-Indo-European.
British Dictionary definitions for proto-indo-european
Proto-Indo-European
noun
the prehistoric unrecorded language that was the ancestor of all Indo-European languages