Proper noun
Proto-Finnic
(linguistics, uncountable) The hypothetical ancestor language or protolanguage of the Baltic-Finnic languages. Usually written with the UPA-transcription system.
With respect to the Proto-Finnic language, elision has occurred; thus, the actual case marker may be absent, but the stem is changed, cf. maja – majja and the Ostrobothnia dialect of Finnish maja – majahan. Source: Internet
The metre is thought to have originated during the Proto-Finnic period. Source: Internet