The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

Ship \Ship\, n. [OE. ship, schip, AS. scip; akin to OFries.
   skip, OS. scip, D. schip, G. schiff, OHG. scif, Dan. skib,
   Sw. skeep, Icel. & Goth. skip; of unknown origin. Cf.
   Equip, Skiff, Skipper.]
   1. Any large seagoing vessel.
      [1913 Webster]

            Like a stately ship . . .
            With all her bravery on, and tackle trim,
            Sails filled, and streamers waving.   --Milton.
      [1913 Webster]

            Thou, too, sail on, O Ship of State!  --Longfellow.
      [1913 Webster]

   2. Specifically, a vessel furnished with a bowsprit and three
      masts (a mainmast, a foremast, and a mizzenmast), each of
      which is composed of a lower mast, a topmast, and a
      topgallant mast, and square-rigged on all masts. See
      Illustation in Appendix.
      [1913 Webster]
      [1913 Webster] l Port or Larboard Side; s Starboard Side;
      1 Roundhouse or Deck House; 2 Tiller; 3 Grating; 4 Wheel;
      5 Wheel Chains; 6 Binnacle; 7 Mizzenmast; 8 Skylight; 9
      Capstan; 10 Mainmast; 11 Pumps; 12 Galley or Caboose; 13
      Main Hatchway; 14 Windlass; 15 Foremast; 16 Fore Hatchway;
      17 Bitts; 18 Bowsprit; 19 Head Rail; 20 Boomkins; 21
      Catheads on Port Bow and Starboard Bow; 22 Fore Chains; 23
      Main Chains; 24 Mizzen Chains; 25 Stern.
      [1913 Webster]
      [1913 Webster] 1 Fore Royal Stay; 2 Flying Jib Stay; 3
      Fore Topgallant Stay;4 Jib Stay; 5 Fore Topmast Stays; 6
      Fore Tacks; 8 Flying Martingale; 9 Martingale Stay,
      shackled to Dolphin Striker; 10 Jib Guys; 11 Jumper Guys;
      12 Back Ropes; 13 Robstays; 14 Flying Jib Boom; 15 Flying
      Jib Footropes; 16 Jib Boom; 17 Jib Foottropes; 18
      Bowsprit; 19 Fore Truck; 20 Fore Royal Mast; 21 Fore Royal
      Lift; 22 Fore Royal Yard; 23 Fore Royal Backstays; 24 Fore
      Royal Braces; 25 Fore Topgallant Mast and Rigging; 26 Fore
      Topgallant Lift; 27 Fore Topgallant Yard; 28 Fore
      Topgallant Backstays; 29 Fore Topgallant Braces; 30 Fore
      Topmast and Rigging; 31 Fore Topsail Lift; 32 Fore Topsail
      Yard; 33 Fore Topsail Footropes; 34 Fore Topsail Braces;
      35 Fore Yard; 36 Fore Brace; 37 Fore Lift; 38 Fore Gaff;
      39 Fore Trysail Vangs; 40 Fore Topmast Studding-sail Boom;
      41 Foremast and Rigging; 42 Fore Topmast Backstays; 43
      Fore Sheets; 44 Main Truck and Pennant; 45 Main Royal Mast
      and Backstay; 46 Main Royal Stay; 47 Main Royal Lift; 48
      Main Royal Yard; 49 Main Royal Braces; 50 Main Topgallant
      Mast and Rigging; 51 Main Topgallant Lift; 52 Main
      Topgallant Backstays; 53 Main Topgallant Yard; 54 Main
      Topgallant Stay; 55 Main Topgallant Braces; 56 Main
      Topmast and Rigging; 57 Topsail Lift; 58 Topsail Yard; 59
      Topsail Footropes; 60 Topsail Braces; 61 Topmast Stays; 62
      Main Topgallant Studding-sail Boom; 63 Main Topmast
      Backstay; 64 Main Yard; 65 Main Footropes; 66 Mainmast and
      Rigging; 67 Main Lift; 68 Main Braces; 69 Main Tacks; 70
      Main Sheets; 71 Main Trysail Gaff; 72 Main Trysail Vangs;
      73 Main Stays; 74 Mizzen Truck; 75 Mizzen Royal Mast and
      Rigging; 76 Mizzen Royal Stay; 77 Mizzen Royal Lift; 78
      Mizzen Royal Yard; 79 Mizzen Royal Braces; 80 Mizzen
      Topgallant Mast and Rigging; 81 Mizzen Topgallant Lift; 82
      Mizzen Topgallant Backstays; 83 Mizzen Topgallant Braces;
      84 Mizzen Topgallant Yard; 85 Mizzen Topgallant Stay; 86
      Mizzen Topmast and Rigging; 87 Mizzen Topmast Stay; 88
      Mizzen Topsail Lift; 89 Mizzen Topmast Backstays; 90
      Mizzen Topsail Braces; 91 Mizzen Topsail Yard; 92 Mizzen
      Topsail Footropes; 93 Crossjack Yard; 94 Crossjack
      Footropes; 95 Crossjack Lift; 96 Crossjack Braces; 97
      Mizzenmast and Rigging; 98 Mizzen Stay; 99 Spanker Gaff;
      100 Peak Halyards; 101 Spanker Vangs; 102 Spanker Boom;
      103 Spanker Boom Topping Lift; 104 Jacob's Ladder, or
      Stern Ladder; 105 Spanker Sheet; 106 Cutwater; 107
      Starboard Bow; 108 Starboard Beam; 109 Water Line; 110
      Starboard Quarter; 111 Rudder.
      [1913 Webster]

   3. A dish or utensil (originally fashioned like the hull of a
      ship) used to hold incense. [Obs.] --Tyndale.
      [1913 Webster]

   Armed ship, a private ship taken into the service of the
      government in time of war, and armed and equipped like a
      ship of war. [Eng.] --Brande & C.

   General ship. See under General.

   Ship biscuit, hard biscuit prepared for use on shipboard;
      -- called also ship bread. See Hardtack.

   Ship boy, a boy who serves in a ship. "Seal up the ship
      boy's eyes." --Shak.

   Ship breaker, one who breaks up vessels when unfit for
      further use.

   Ship broker, a mercantile agent employed in buying and
      selling ships, procuring cargoes, etc., and generally in
      transacting the business of a ship or ships when in port.


   Ship canal, a canal suitable for the passage of seagoing
      vessels.

   Ship carpenter, a carpenter who works at shipbuilding; a
      shipwright.

   Ship chandler, one who deals in cordage, canvas, and other,
      furniture of vessels.

   Ship chandlery, the commodities in which a ship chandler
      deals; also, the business of a ship chandler.

   Ship fever (Med.), a form of typhus fever; -- called also
      putrid fever, jail fever, or hospital fever.

   Ship joiner, a joiner who works upon ships.

   Ship letter, a letter conveyed by a ship not a mail packet.


   Ship money (Eng. Hist.), an imposition formerly charged on
      the ports, towns, cities, boroughs, and counties, of
      England, for providing and furnishing certain ships for
      the king's service. The attempt made by Charles I. to
      revive and enforce this tax was resisted by John Hampden,
      and was one of the causes which led to the death of
      Charles. It was finally abolished.

   Ship of the line. See under Line.

   Ship pendulum, a pendulum hung amidships to show the extent
      of the rolling and pitching of a vessel.

   Ship railway.
      (a) An inclined railway with a cradelike car, by means of
          which a ship may be drawn out of water, as for
          repairs.
      (b) A railway arranged for the transportation of vessels
          overland between two water courses or harbors.

   Ship's company, the crew of a ship or other vessel.

   Ship's days, the days allowed a vessel for loading or
      unloading.

   Ship's husband. See under Husband.

   Ship's papers (Mar. Law), papers with which a vessel is
      required by law to be provided, and the production of
      which may be required on certain occasions. Among these
      papers are the register, passport or sea letter, charter
      party, bills of lading, invoice, log book, muster roll,
      bill of health, etc. --Bouvier. --Kent.

   To make ship, to embark in a ship or other vessel.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ship biscuit
    n 1: very hard unsalted biscuit or bread; a former ship's staple
         [syn: hardtack, pilot biscuit, pilot bread, sea
         biscuit, ship biscuit]