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tref

[treyf] /treɪf/
adjective
1.
Judaism. unfit to be eaten or used, according to religious laws; not kosher.
Also, treyf, trayf, terefah.
Origin
< Yiddish treyf < Hebrew ṭərēphāh torn flesh, literally, something torn
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tref

tref

/treɪf/
adjective
1.
(Judaism) ritually unfit to be eaten; not kosher
Word Origin
Yiddish, from Hebrew terēphāh, literally: torn (i.e., animal meat torn by beasts), from tāraf to tear
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for tref
n.

Welsh, literally "hamlet, home, town."

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for tref

any food, food product, or utensil that, according to the Jewish dietary laws (kashruth, q.v.), is not ritually clean or prepared according to law and is thus prohibited as unfit for Jewish use. Terefah is thus the antithesis of kosher ("fit"). The broad connotation of terefah derives from a more specific prohibition against eating meat that has been "torn" by a wild animal (e.g., Exodus 22:31).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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