1. adjective /ˈjɪd.ɪʃ/
a) Of or pertaining to the Yiddish language.
b) Jewish.
2. noun /ˈjɪd.ɪʃ/
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.
See Also: Yiddishist, Yiddishism, Yiddishkeit
Wikipedia foundation.