- (linguistics, uncountable) The hypothetical ancestor language or protolanguage of Indo-Aryan languages, the Iranian languages, the Dardic languages and the Nuristani languages.
ancestor language of Indo-Aryan, Iranian, Dardic and Nuristani languages
person who spoke the Proto-Indo-Iranian language
Proto-Indo-Iranian (not comparable)
- (linguistics, anthropology) Of or pertaining to the Proto-Indo-Iranian language, or the people who spoke it.
pertaining to the Proto-Indo-Iranian language, or the people who spoke it