Biscotti is the plural form of biscotto. The word originates from the Latin word biscoctus, meaning twice cooked (or baked). To make biscotti, for example, a single loaf of dough is baked in the oven. The loaf is removed from the oven, then cut into slices. The slices are then baked for a second time. Baking twice ensures that the cookies are dry, so they can be stored for long periods of time. Long shelf life makes biscotti useful for long journeys.