Malformation

from WordNet (r) 3.0 (2006)

malformation
    n 1: an affliction in which some part of the body is misshapen
         or malformed [syn: {deformity}, {malformation},
         {misshapenness}]
    2: something abnormal or anomalous [syn: {malformation},
       {miscreation}]

from The Collaborative International Dictionary of English v.0.48

Malformation \Mal`for*ma"tion\, n. [Mal- + formation.]
   Ill formation; irregular or anomalous formation; abnormal or
   wrong conformation or structure; -- often used of body parts
   such as limbs which do not develop properly during fetal
   maturation.
   [1913 Webster +PJC]

from Moby Thesaurus II by Grady Ward, 1.0

49 Moby Thesaurus words for "malformation":
      absurdity, anticness, bizarreness, bizarrerie, bowlegs, camelback,
      cleft palate, clubfoot, crookback, curiousness, defacement,
      deformation, deformity, disfigurement, distortion, fantasticality,
      flatfoot, freakishness, grotesqueness, grotesquerie, harelip,
      humpback, hunchback, knock-knee, kyphosis, lordosis,
      malconformation, misproportion, misshape, monstrosity,
      monstrousness, mutilation, oddity, outlandishness, peculiarity,
      quaintness, queerness, singularity, splayfoot, strangeness,
      swayback, talipes, teratism, teratology, torticollis, truncation,
      valgus, weirdness, wryneck