ship biscuit; hardtack.
Origin of sea bread
First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for sea bread
Historical Examples of sea bread
The cook had boiled me a piece of salt beef to carry with me, and put up two or three pounds of sea-bread.Journal of Voyages