The Collaborative International Dictionary of English v.0.48:

Dispart \Dis*part"\, v. t.
   1. (Gun.) To make allowance for the dispart in (a gun), when
      taking aim.
      [1913 Webster]

            Every gunner, before he shoots, must truly dispart
            his piece.                            --Lucar.
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   2. (Gun.) To furnish with a dispart sight.
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The Collaborative International Dictionary of English v.0.48:

Dispart \Dis*part"\, v. t. [imp. & p. p. Disparted; p. pr. &
   vb. n. Disparting.] [Pref. dis- + part: cf. OF. despartir.]
   To part asunder; to divide; to separate; to sever; to rend;
   to rive or split; as, disparted air; disparted towers.
   [Archaic]
   [1913 Webster]

         Them in twelve troops their captain did dispart.
                                                  --Spenser.
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         The world will be whole, and refuses to be disparted.
                                                  --Emerson.
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The Collaborative International Dictionary of English v.0.48:

Dispart \Dis*part"\, v. i.
   To separate, to open; to cleave.
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The Collaborative International Dictionary of English v.0.48:

Dispart \Dis*part"\, n.
   1. (Gun.) The difference between the thickness of the metal
      at the mouth and at the breech of a piece of ordnance.
      [1913 Webster]

            On account of the dispart, the line of aim or line
            of metal, which is in a plane passing through the
            axis of the gun, always makes a small angle with the
            axis.                                 --Eng. Cys.
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   2. (Gun.) A piece of metal placed on the muzzle, or near the
      trunnions, on the top of a piece of ordnance, to make the
      line of sight parallel to the axis of the bore; -- called
      also dispart sight, and muzzle sight.
      [1913 Webster]