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

disorder \disor"der\, n. pref. dis- + order: cf. f.
   d'esordre.
   1. want of order or regular disposition; lack of arrangement;
      confusion; disarray; as, the troops were thrown into
      disorder; the papers are in disorder.
      1913 webster

   2. neglect of order or system; irregularity.
      1913 webster

            from vulgar bounds with brave disorder part,
            and snatch a grace beyond the reach of art. --pope.
      1913 webster

   3. breach of public order; disturbance of the peace of
      society; tumult. --shak.
      1913 webster

   4. disturbance of the functions of the animal economy or of
      the soul; sickness; derangement. "disorder in the body."
      --locke.

   syn: irregularity; disarrangement; confusion; tumult; bustle;
        disturbance; disease; illness; indisposition; sickness;
        ailment; malady; distemper. see disease.
        1913 webster
see also:
disease 

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

disorder \disor"der\, v. t. imp.  p. p. disordered; p. pr.
    vb. n. disordering.
   1. to disturb the order of; to derange or disarrange; to
      throw into confusion; to confuse.
      1913 webster

            disordering the whole frame or jurisprudence.
                                                  --burke.
      1913 webster

            the burden . . . disordered the aids and auxiliary
            rafters into a common ruin.           --jer. taylor.
      1913 webster

   2. to disturb or interrupt the regular and natural functions
      of either body or mind; to produce sickness or
      indisposition in; to discompose; to derange; as, to
      disorder the head or stomach.
      1913 webster

            a man whose judgment was so much disordered by party
            spirit.                               --macaulay.
      1913 webster

   3. to depose from holy orders. obs. --dryden.

   syn: to disarrange; derange; confuse; discompose.
        1913 webster
see also:
disordered disordering 

[3] : WordNet (r) 2.0

disorder
     n 1: condition in which there is a disturbance of normal
          functioning; "the doctor prescribed some medicine for
          the disorder"; "everyone gets stomach upsets from time
          to time" syn: upset
     2: a condition in which things are not in their expected
        places; "the files are in complete disorder" syn: disorderliness
        ant: orderliness, orderliness
     3: a disturbance of the peace or of public order ant: order
     v 1: disturb in mind or make uneasy or cause to be worried or
          alarmed; "she was rather perturbed by the news that her
          father was seriously ill" syn: perturb, unhinge, disquiet,
           trouble, cark, distract
     2: bring disorder to syn: disarray ant: order
see also:
upset disorderliness orderliness order perturb unhinge 
disquiet trouble cark distract disarray 

[4] : Moby Thesaurus II by Grady Ward, 1.0

390 moby thesaurus words for "disorder":
   abnormality, acute disease, affection, afflict, affliction, affray,
   agitation, ailment, allergic disease, allergy, aloofness, amorphia,
   amorphism, amorphousness, anarchism, anarcho-syndicalism, anarchy,
   anomie, antinomianism, ataxia, atrophy, bacterial disease, badness,
   ball up, battle, battle royal, bedlam, befuddle, befuddlement,
   bewilderment, birth defect, blight, blobbiness, blur, blurriness,
   bluster, bobbery, boil, boiling, bother, botheration, brawl,
   broadness, brouhaha, bustle, capriciousness,
   cardiovascular disease, changeability, changeableness, chaos,
   choppiness, chronic disease, churn, circulatory disease,
   civil disorder, clamor, cloud, clutter, commotion, complaint,
   complication, condition, confound, confuse, confusion,
   congenital defect, conturbation, convulsion, criminal syndicalism,
   dappleness, daze, debilitate, defect, deficiency disease, deform,
   deformity, degenerative disease, derange, derangement, deviation,
   devitalize, difference, differentiation, diffusion, disability,
   disable, disarrange, disarrangement, disarray, discombobulation,
   discomfiture, discompose, discomposure, disconcertion,
   discontinuity, discourtesy, discreteness, disease, dishevel,
   disjoint, disjunction, dislocate, dislocation, disorderliness,
   disorderly conduct, disorganization, disorganize, disorientation,
   dispersal, dispersion, disquiet, disquietude, disrupt, disruption,
   disruptiveness, dissolution, distemper, distort, disturb,
   disturbance, divarication, divergence, diversification, ebullition,
   embarrassment, embroil, embroilment, endemic, endemic disease,
   endocrine disease, enervate, enfeeble, entropy, epidemic disease,
   excitement, ferment, fermentation, fever, feverishness, fidgets,
   fight, flap, flummox, flurry, fluster, flutter, flutteration, fog,
   fog up, fogginess, foment, formlessness, fracas, fray,
   free-for-all, frenzy, frowned-upon behavior, fuddle, fuddlement,
   fume, functional disease, fungus disease, fuss, fuzziness,
   gastrointestinal disease, generality, genetic disease, handicap,
   hash, haze, haziness, hereditary disease, hooliganism, horseplay,
   hospitalize, hubbub, huddle, hullabaloo, hurly-burly,
   iatrogenic disease, ill, ill-definedness, illness, imprecision,
   impropriety, inaccuracy, incapacitate, inchoateness, incoherence,
   inconsistency, inconstancy, indecisiveness, indefinableness,
   indefiniteness, indeterminateness, indispose, indisposition,
   inequality, inexactness, infectious disease, infirmity, inquietude,
   insanity, instability, invalid, irregularity, jerkiness, jitters,
   jumble, jumpiness, knock galley-west, laxity, lay up, litter,
   looseness, lynch law, maelstrom, malady, malaise, maze, melee,
   mercuriality, mess, mess up, messiness, misarrange, misarrangement,
   misbehavior, misconduct, misdemeanor, misdoing, mishmash, misrule,
   mist, mistiness, mix up, mob law, mob rule, mobocracy, moil,
   morbidity, morbus, motleyness, muddle, muddlement,
   muscular disease, muss, muss up, mutability, naughtiness,
   nerviness, nervosity, nervousness, neurological disease, nihilism,
   nonadhesion, noncohesion, nonconformism, nonconformity,
   nonsanctioned behavior, nonstandardization, nonuniformity,
   nutritional disease, obfuscate, obscuration, obscure, obscurity,
   occupational disease, ochlocracy, orderlessness, organic disease,
   pandemic disease, pandemonium, pathological condition, pathology,
   perplexity, perturb, perturbation, plant disease, pluralism,
   pother, primal chaos, protozoan disease, psychosomatic disease,
   pucker, raggedness, rebellion, reduce, respiratory disease,
   restlessness, revolution, riot, rockiness, roil, roughhouse, rout,
   row, rowdiness, rowdyism, ruffianism, ruffle, rummage, rumple,
   rumpus, scatter, scattering, scramble, scuffle, secondary disease,
   seediness, seethe, seething, separateness, shake up, shambles,
   shapelessness, shuffle, shuffling, sicken, sickishness, sickness,
   signs, snarl, stew, stir, sweat, sweepingness, swirl, swivet,
   symptomatology, symptomology, symptoms, syndicalism, syndrome,
   tangle, the pip, tizzy, to-do, tohubohu, topsy-turviness, tousle,
   trepidation, trepidity, tumble, tumult, tumultuation, turbidity,
   turbulence, turmoil, turn, twitter, unadherence, unadhesiveness,
   unclearness, unconformism, unconformity, unease, unevenness,
   unform, unhinge, unorthodoxy, unrest, unruliness, unsettle,
   unsettlement, unshape, unsteadiness, untenacity, untidiness,
   upheaval, uproar, upset, urogenital disease, vagueness, vandalism,
   variability, variation, variegation, variety, variousness,
   venial sin, versatility, vice, violence, virus disease,
   wasting disease, wavering, weaken, worm disease, wrongdoing

Disorder >> D Words
Disorder, definition of term: Disorder
disorder_pag1.html

Phobic Disorder >> P Words
Phobic Disorder, definition of term: Phobic Disorder
phobic+disorder_pag1.html

Mental Disorder >> M Words
Mental Disorder, definition of term: Mental Disorder
mental+disorder_pag1.html

Blood Disorder >> B Words
Blood Disorder, definition of term: Blood Disorder
blood+disorder_pag1.html