Frankish

[frang-kish] /ˈfræŋ kɪʃ/
adjective
1.
of or pertaining to the Franks.
noun
2.
the West Germanic language of the ancient Franks; Old Franconian.
Compare Frank (def 1).
Origin
1585-95; Frank + -ish1
British Dictionary definitions for Frankish

Frankish

/ˈfræŋkɪʃ/
noun
1.
the ancient West Germanic language of the Franks, esp the dialect that contributed to the vocabulary of modern French See also Franconian, Old High German
adjective
2.
of or relating to the Franks or their language
Word Origin and History for Frankish
adj.

1802, from Frank + -ish. As the name of a germanic language spoken by the ancient Franks, from 1863. (Frenkis is recorded c.1400.)