[1] : The Collaborative International Dictionary of English v.0.48

hardtack \hard"tack`\ or hard-tack
\hard"-tack`\haumrd"ta^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
see also:
pilot biscuit pilot bread ship biscuit ship bread cercocarpus betuloides 

[2] : The Collaborative International Dictionary of English v.0.48

pilot \pi"lot\, n. f. pilote, prob. from d. peillood plummet,
   sounding lead; peilen, pegelen, to sound, measure fr. d. 
   g. peil, pegel, a sort of measure, water mark + lood lead,
   akin to e. lead. the pilot, then, is the lead man, i. e., he
   who throws the lead. see pail, and lead a metal.
   1. naut. one employed to steer a vessel; a helmsman; a
      steersman. --dryden.
      1913 webster

   2. specifically, a person duly qualified, and licensed by
      authority, to conduct vessels into and out of a port, or
      in certain waters, for a fixed rate of fees.
      1913 webster

   3. figuratively: a guide; a director of another through a
      difficult or unknown course.
      1913 webster

   4. an instrument for detecting the compass error.
      1913 webster

   5. the cowcatcher of a locomotive. u.s.
      1913 webster

   6. a"eronautics one who flies, or is qualified to fly, an
      airplane, balloon, or other flying machine.
      webster 1913 suppl. +pjc

   7. mach. a short plug at the end of a counterbore to guide
      the tool. pilots are sometimes made interchangeable.
      webster 1913 suppl.

   8. mining the heading or excavation of relatively small
      dimensions, first made in the driving of a larger tunnel.
      webster 1913 suppl.

   9. television a filmed or taped episode of a proposed
      television series, produced as an example of the series.
      it may be shown only to those television broadcast
      executives who may decide whether to buy the rights to the
      series, or aired to test viewer reaction or to interest
      sponsors. also called pilot film or pilot tape.
      pjc

   pilot balloon, a small balloon sent up in advance of a
      large one, to show the direction and force of the wind.

   pilot bird. zool.
      a a bird found near the caribbee islands; -- so called
          because its presence indicates to mariners their
          approach to these islands. --crabb.
      b the black-bellied plover. local, u.s.

   pilot boat, a strong, fast-sailing boat used to carry and
      receive pilots as they board and leave vessels.

   pilot bread, ship biscuit.

   pilot cloth, a coarse, stout kind of cloth for overcoats.
      

   pilot engine, a locomotive going in advance of a train to
      make sure that the way is clear.

   pilot fish. zool
      a a pelagic carangoid fish naucrates ductor; -- so
          named because it is often seen in company with a
          shark, swimming near a ship, on account of which
          sailors imagine that it acts as a pilot to the shark.
      b the rudder fish seriola zonata.

   pilot jack, a flag or signal hoisted by a vessel for a
      pilot.

   pilot jacket, a pea jacket.

   pilot nut bridge building, a conical nut applied
      temporarily to the threaded end of a pin, to protect the
      thread and guide the pin when it is driven into a hole.
      --waddell.

   pilot snake zool.
      a a large north american snake coluber obsoleus. it
          is lustrous black, with white edges to some of the
          scales. called also mountain black snake.
      b the pine snake.

   pilot whale. zool. same as blackfish, 1.
      1913 webster
see also:
pail lead pilot film pilot tape pilot balloon pilot bird 
pilot boat pilot bread pilot cloth pilot engine pilot fish 
naucrates ductor seriola zonata pilot jack pilot jacket pilot nut 
pilot snake coluber obsoleus mountain black snake pilot whale blackfish 

[3] : WordNet (r) 2.0

pilot bread
     n : very hard unsalted biscuit or bread; a former ship's staple
         syn: hardtack, pilot biscuit, sea biscuit, ship
         biscuit
see also:
hardtack pilot biscuit sea biscuit ship biscuit 

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Bread, definition of term: Bread
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Pilot, definition of term: Pilot
pilot_pag1.html

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Bread Mold, definition of term: Bread Mold
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Bread Board, definition of term: Bread Board
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Pilot Boat, definition of term: Pilot Boat
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Monkey Bread, definition of term: Monkey Bread
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Corn Bread, definition of term: Corn Bread
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Bread And Butte, definition of term: Bread And Butte
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