Wiktionary
sea biscuit
n. cake urchin
WordNet
sea biscuit
n. very hard unsalted biscuit or bread; a former ship's staple [syn: hardtack, pilot biscuit, pilot bread, ship biscuit]
Usage examples of "sea biscuit".
After the hard sea biscuit, this tasted perfectly delicious, and Peter, not knowing what strange adventures lay ahead, ate every scrap.