'Tref' definitions:

Definition of 'tref'

From: WordNet
adjective
Not conforming to dietary laws [syn: nonkosher, tref, terefah]

Definition of 'Tref'

From: GCIDE
  • Tref \Tref\ (tr[e^]f), a. [Yiddish, fr. Heb. t[e^]r[=e]ph[=a]h an animal torn by wild beasts.] Ceremonially unclean, according to the Jewish law; -- opposed to kosher. [Webster 1913 Suppl.]