In the tree model of historical linguistics, a proto-language is a postulated and unattested once-spoken ancestral language from which a number of attested languages are believed to have descended by evolution, forming a language family. Proto-languages are usually unattested, or in some cases only partially attested.

Is Ursprache an English word?

Definition of Ursprache in the English dictionary

The definition of Ursprache in the dictionary is any hypothetical extinct and unrecorded language reconstructed from groups of related recorded languages.

What does the word Cymotrichous mean?

: having the hair wavy a cymotrichous race.