Proto-Germanic
[proh-toh-jer-
man
-ik]
/ˌproʊ toʊ dʒərˈmæn ɪk/
noun
1.
the unattested prehistoric parent language of the Germanic languages; Germanic.
adjective
2.
of or pertaining to Proto-Germanic.
British Dictionary definitions for
Proto-Germanic
Proto-Germanic
noun
1.
the prehistoric unrecorded language that was the ancestor of all Germanic languages