Definition from Wiktionary, the free dictionary
Proper noun 
- (linguistics, uncountable) The hypothetical ancestor language or protolanguage of Finnic and Ugric languages. Usually written with the UPA-transcription system.
- (anthropology, countable) A person who spoke the Proto-Finno-Ugric language.
See also 
Proto-Finno-Ugric is the hypothetical ancestor language of the following major groups: