Batul - to nullify. Batul refers to a situation when a small amount of prohibited food is accidentally mixed into a larger amount of a different food....

Bishul Yisroel refers to the preparation of certain foods for which it is necessary for the Mashgiach to light the fire.

Chodosh, literally, new, refers to the grain (wheat, barley, oats, rye, and spelt) that has not taken root before Passover. It is called "new grain."...