A language used by German and other Jews, being a Middle German dialect developed under Hebrew and Slavic influence. It is written in Hebrew characters. [Webster 1913 Suppl.]

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OXFORD DICTIONARY

yiddish, n. & adj.
--n. a vernacular used by Jews in or from central and eastern Europe, orig. a German dialect with words from Hebrew and several modern languages.
--adj. of or relating to this language.

Etymology

G j{uuml}disch Jewish

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