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pilot biscuit

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noun
  1. hardtack.
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Origin of pilot biscuit

An Americanism dating back to 1830–40
Also called pilot bread.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for pilot biscuit

pilot biscuit

noun
  1. another term for hardtack
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012