The Collaborative International Dictionary of English v.0.48:

Hull \Hull\, n. [OE. hul, hol, shell, husk, AS. hulu; akin to G.
   h["u]lle covering, husk, case, h["u]llen to cover, Goth.
   huljan to cover, AS. helan to hele, conceal. [root]17. See
   Hele, v. t., Hell.]
   1. The outer covering of anything, particularly of a nut or
      of grain; the outer skin of a kernel; the husk.
      [1913 Webster]

   2. [In this sense perh. influenced by D. hol hold of a ship,
      E. hold.] (Naut.) The frame or body of a vessel, exclusive
      of her masts, yards, sails, and rigging.
      [1913 Webster]

            Deep in their hulls our deadly bullets light.
                                                  --Dryden.
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   Hull down, said of a ship so distant that her hull is
      concealed by the convexity of the sea.
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The Collaborative International Dictionary of English v.0.48:

Hull \Hull\, v. t. [imp. & p. p. Hulled; p. pr. & vb. n.
   Hulling.]
   1. To strip off or separate the hull or hulls of; to free
      from integument; as, to hull corn.
      [1913 Webster]

   2. To pierce the hull of, as a ship, with a cannon ball.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hull \Hull\, v. i.
   To toss or drive on the water, like the hull of a ship
   without sails. [Obs.] --Shak. Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hull
    n 1: dry outer covering of a fruit or seed or nut
    2: persistent enlarged calyx at base of e.g. a strawberry or
       raspberry
    3: United States naval officer who commanded the `Constitution'
       during the War of 1812 and won a series of brilliant
       victories against the British (1773-1843) [syn: Hull,
       Isaac Hull]
    4: United States diplomat who did the groundwork for creating
       the United Nations (1871-1955) [syn: Hull, Cordell Hull]
    5: a large fishing port in northeastern England [syn: Hull,
       Kingston-upon Hull]
    6: the frame or body of ship
    v 1: remove the hulls from; "hull the berries"