Noun
very hard unsalted biscuit or bread; a former ship's staple
a mountain mahogany
Source: WordNetThey say it only takes an instant to have a dream; a dream can be compressed into hardtack. Gao Xingjian
SOUTHERLY GALES RAIN SQUALLS LEE RAIL UNDER WATER WET BUNKS HARDTACK BULLY BEEF HAVING WONDERFUL TIME WISH YOU WERE HERE INSTEAD OF ME. Richard Halliburton
First, make some hardtack that’s going to last as long as you could want. Source: Internet
Once its defenses were complete, Sherman established his main supply depot there, placing a million pounds of hardtack and salt pork in warehouses near the railroad, along with 9,000 head of cattle in the valleys around the town. Source: Internet