Definitions for yiddishˈyɪd ɪʃ
Random House Webster's College Dictionary
(n.)a language of central and E European Jews and their descendants elsewhere: based on Rhenish dialects of Middle High German with an admixture of vocabulary from Hebrew and Aramaic, the Slavic languages, and other sources, and written in the Hebrew alphabet.
(adj.)of or pertaining to Yiddish.
Origin of Yiddish:
a dialect of High German including some Hebrew and other words; spoken in Europe as a vernacular by many Jews; written in the Hebrew script
A West Germanic language that developed from Middle High German dialects, with an admixture of vocabulary from multiple source languages including Hebrew-Aramaic, Romance, Slavic, English, etc., and written in Hebrew characters which is used mainly among Ashkenazic Jews from central and eastern Europe.
Of or pertaining to the Yiddish language.
Origin: The etymology of this word is mostly obscure. ייִדיש, from Yidish Daytsh, from jüdisch diutsch, cognate with German jüdisch. (also called Judeo-German, Judendeutsch; see Ashkenazi)
The Nuttall Encyclopedia
a kind of mongrel language spoken by foreign Jews in England.