a. - Ceremonially clean, according to Jewish law; -- applied to food, esp. to meat of animals slaughtered according to the requirements of Jewish law. Opposed to tref. Hence, designating a shop, store, house, etc., where such food is sold or used.
n. - Kosher food; also, a kosher shop.
v. t. - To prepare in conformity with the requirements of the Jewish law, as meat.