Definition of "zwieback" []

• A usually sweetened bread baked first as a loaf and later cut into slices and toasted. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Carefully made toast, "zwieback," and stale bread may be given to young children."
• "Beginning at the beginning and learning from the ground up was a long course for Bibbs at the sanitarium, with milk and "zwieback" as the basis of instruction; and the months were many and tiresome before he was considered near enough graduation to go for a walk leaning on a nurse and a cane."
• "But Beethoven was intellectually brought up on Enlightenment zwieback, and while his curiosity kept him current with the likes of Schiller and Schlegel and Fichte and Herder, he always kept Immanuel Kant, the defender of rationalism as a particular light."