zwieback

Now, however, he manages his th's perfectly, and I don't think he had Zwieback in his mouth when he talked with me.
Major Prophets of To-Day|Edwin E. Slosson
Having failed to find him in his cabin, he was bringing him his zwieback and large peasant cup of tea on deck.
Atlantis|Gerhart Hauptmann
Zwieback, zvī′bak, n. biscuit rusk, or a sweet spiced bread toasted.
Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements)|Various
Perhaps you will allow me to offer you some of our zwieback, put in Miss Campbell, stretching forth her hand for the box.
The Motor Maids Across the Continent|Katherine Stokes

She must be sure and pack her prayer books and Bible, and twenty pounds of zwieback at the least.
The Promised Land|Mary Antin

British Dictionary definitions for zwieback

zwieback

/ (ˈzwaɪˌbæk, ˈzwiː-, German ˈtsviːbak) /

noun

a small type of rusk, which has been baked first as a loaf, then sliced and toasted, usually bought ready-made

Word Origin for zwieback

German: twice-baked

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012