the hypothetical language, reconstructed by modern linguists, from which the Indo-European languages are thought to have descended
The reconstructed language that was the ancestor of the Indo-European languages.
Of, relating to, or being Proto-Indo-European or one of its reconstructed linguistic features.
- (anthropology, countable) A person who spoke the Proto-Indo-European language.
- (linguistics, anthropology) Of or pertaining to the Proto-Indo-European language, or the people who spoke it.