The Collaborative International Dictionary
ship biscuit
Hardtack \Hard"tack`\ or Hard-tack \Hard"-tack`\(h[aum]rd"t[a^]k`), n.
A name given by soldiers and sailors to a kind of unleavened hard biscuit or sea bread. Called also pilot biscuit, pilot bread, ship biscuit and ship bread
Any of several mahogany trees, esp. the Cercocarpus betuloides.
--MW10
Wiktionary
ship biscuit
n. (context nautical English) hardtack
WordNet
ship biscuit
n. very hard unsalted biscuit or bread; a former ship's staple [syn: hardtack, pilot biscuit, pilot bread, sea biscuit]
Usage examples of "ship biscuit".
It was made of small juicy clams, scarcely bigger than hazel nuts, mixed with pounded ship biscuit, and salted pork cut up into little flakes.