D defs.my
Entry 2 senses Webster, 1913

Hardtack

/(härd"tăk`)/ · Hard·tack · IPA
01 n. A name given by soldiers and sailors to a kind of unleavened hard biscuit or sea bread. Called also pilot biscuit, pilot bread, ship biscu…
  1. 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 Also: pilot biscuit, pilot bread, ship biscuit, ship bread
  2. 2.
    Any of several mahogany trees, esp. the Cercocarpus betuloides.