Sometimes ship bread.
Origin of ship biscuit
First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ship biscuit
We wound up the evening with ship-biscuit and brandy-and-water—ration brandy—French—superb.
We made porridge, for we had still a good supply of oatmeal, and of ship-biscuit.
On the third day the white bread had become as hard as ship-biscuit, so that we had to break it up and soak it in water.A Visit to the Holy Land, Egypt, and Italy
Jim at this came running out of the cave with a face of joy, a bag of ship-biscuit, and a lot of other things.Robbery Under Arms
Thomas Alexander Browne, AKA Rolf Boldrewood
Oatmeal or ship-biscuit ought always to be given, if alone the better, else rice upon which gravy has been poured.The Dog
Dinks, Mayhew, and Hutchinson