'Hard-tack' definitions:

Definition of 'Hard-tack'

From: GCIDE
  • Hardtack \Hard"tack`\ or Hard-tack \Hard"-tack`\(h[aum]rd"t[a^]k`), n.
  • 1. A name given by soldiers and sailors to a kind of unleavened hard biscuit or sea bread. Called also {pilot biscuit}, pilot bread, ship biscuit and ship bread [1913 Webster]
  • 2. Any of several mahogany trees, esp. the {Cercocarpus betuloides}. --MW10 [PJC]