zwieback

Noun

Synonyms: rusk Brussels biscuit twice-baked bread

WordNet 3.0

Noun (1)

slice of sweet raised bread baked again until it is brown and hard and crispSynonyms: rusk Brussels biscuit twice-baked bread

Webster's Dictionary (GCIDE)

Zwieback \Zwie"back`\ (tsv[=e]"b[aum]k`), n. [G., fr. zwie- two, twice (see Twice) + backen to bake.] A kind of biscuit or rusk first baked in a loaf and afterwards cut and toasted. [Webster 1913 Suppl.]