The American Heritage® Dictionary of the English Language, 4th Edition
adj. Judaism Unclean and unfit for consumption according to dietary law; not kosher.
the GNU version of the Collaborative International Dictionary of English
adj. Ceremonially unclean, according to the Jewish law; -- opposed to kosher.
The Century Dictionary and Cyclopedia
Unlawful; unclean: opposed to kosher as used by Hebrews.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. not conforming to dietary laws
Word Usage
"Sam kept a kosher house, and nonkosher cake is tref from the Yiddish word for unclean, so Reed couldnt bring it in, couldnt even let it touch the silverware."