The Collaborative International Dictionary of English v.0.48:

Rupture \Rup"ture\ (?; 135), n. [L. ruptura, fr. rumpere, ruptum
   to break: cf. F. rupture. See Reave, and cf. Rout a
   defeat.]
   1. The act of breaking apart, or separating; the state of
      being broken asunder; as, the rupture of the skin; the
      rupture of a vessel or fiber; the rupture of a lutestring.
      --Arbuthnot.
      [1913 Webster]

            Hatch from the egg, that soon,
            Bursting with kindly rupture, forth disclosed
            Their callow young.                   --Milton.
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   2. Breach of peace or concord between individuals; open
      hostility or war between nations; interruption of friendly
      relations; as, the parties came to a rupture.
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            He knew that policy would disincline Napoleon from a
            rupture with his family.              --E. Everett.
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   3. (Med.) Hernia. See Hernia.
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   4. A bursting open, as of a steam boiler, in a less sudden
      manner than by explosion. See Explosion.
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   Modulus of rupture. (Engin.) See under Modulus.
      [1913 Webster]

   Syn: Fracture; breach; break; burst; disruption; dissolution.
        See Fracture.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rupture \Rup"ture\, v. t. [imp. & p. p. Ruptured; p. pr. & vb.
   n. Rupturing.]
   1. To part by violence; to break; to burst; as, to rupture a
      blood vessel.
      [1913 Webster]

   2. To produce a hernia in.
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The Collaborative International Dictionary of English v.0.48:

Rupture \Rup"ture\, v. i.
   To suffer a breach or disruption.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hernia \Her"ni*a\, n.; pl. E. Hernias, L. Herni[ae]. [L.]
   (Med.)
   A protrusion, consisting of an organ or part which has
   escaped from its natural cavity, and projects through some
   natural or accidental opening in the walls of the latter; as,
   hernia of the brain, of the lung, or of the bowels. Hernia of
   the abdominal viscera in most common. Called also rupture.
   [1913 Webster]

   Strangulated hernia, a hernia so tightly compressed in some
      part of the channel through which it has been protruded as
      to arrest its circulation, and produce swelling of the
      protruded part. It may occur in recent or chronic hernia,
      but is more common in the latter.
      [1913 Webster]

WordNet (r) 3.0 (2006):

rupture
    n 1: state of being torn or burst open
    2: a personal or social separation (as between opposing
       factions); "they hoped to avoid a break in relations" [syn:
       rupture, breach, break, severance, rift, falling
       out]
    3: the act of making a sudden noisy break
    v 1: separate or cause to separate abruptly; "The rope snapped";
         "tear the paper" [syn: tear, rupture, snap, bust]

Moby Thesaurus II by Grady Ward, 1.0:

200 Moby Thesaurus words for "rupture":
   abrade, abrasion, abysm, abyss, alienation, arroyo, bark, blemish,
   bloody, box canyon, breach, breach of friendship, break, break in,
   break into, break open, break through, break up, breakage,
   breaking, breaking up, burn, burst, burst in, bursting, bust,
   bust in, canyon, cave in, cavity, chafe, chap, chasm, check,
   chimney, chink, chip, claw, cleavage, cleave, cleft, cleuch,
   clough, col, come apart, come unstuck, concussion, coulee, couloir,
   crack, crackle, cranny, craze, crevasse, crevice, cut, cut apart,
   cwm, defile, dell, detachment, dike, disaffection, disfavor,
   disintegrate, disjoin, disrupt, disruption, dissect, dissolution,
   disunion, disunite, disunity, ditch, divergence, divide,
   dividedness, division, divorce, divorcement, donga, draw,
   estrangement, excavation, exfoliate, fall to pieces, falling-out,
   fault, fissure, flash burn, flaw, flume, force open, fracture,
   fray, frazzle, fret, furrow, gall, gap, gape, gash, give away,
   give way, gorge, groove, gulch, gulf, gully, hole, hurt, incise,
   incision, injure, injury, joint, kloof, lacerate, laceration, leak,
   lesion, maim, make mincemeat of, maul, moat, mortal wound,
   mutilate, mutilation, notch, nullah, open, open rupture, opening,
   part, parting, partition, pass, passage, pierce, prize open,
   puncture, ravine, recall of ambassadors, rend, rent, rift, rime,
   rip, rive, run, savage, scald, scale, schism, scissure, scorch,
   scotch, scrape, scratch, scuff, seam, second-degree burn, separate,
   separation, sever, severance, skin, slash, slice, slit, slot, snap,
   sore, splinter, split, split open, split up, split-up, splitting,
   sprain, spring a leak, stab, stab wound, start, stick, stove in,
   strain, sunder, tear, tear open, third-degree burn, trauma,
   traumatize, trench, valley, void, wadi, wound, wounds immedicable,
   wrench