Hardtack

noun

Definitions

Noun
  1. 1
    A large, hard biscuit made from unleavened flour and water; formerly used as a long-term staple food aboard ships. countable, uncountable

    "Meronym: reefer's nut"

  2. 2
    very hard unsalted biscuit or bread; a former ship's staple wordnet
  3. 3
    a mountain mahogany wordnet

Etymology

From hard + tack.

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