noun, plural deformities.
the quality or state of being deformed, disfigured, or misshapen.
Pathology. an abnormally formed part of the body.
a deformed person or thing.
hatefulness; ugliness.

1350–1400; Middle English deformite < Old French < Latin dēfōrmitās, equivalent to dēfōrm(is) deform2 + -itās -ity

nondeformity, noun, plural nondeformities. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deformity (dɪˈfɔːmɪtɪ)
n , pl -ties
1.  a deformed condition; disfigurement
2.  pathol an acquired or congenital distortion of an organ or part
3.  a deformed person or thing
4.  a defect, esp of the mind or morals; depravity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

mid-15c., diformyte, from O.Fr. deformité, from L. deformitas, from deformis, from deformare (see deform).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deformity de·for·mi·ty (dĭ-fôr'mĭ-tē)

  1. The state of being deformed.

  2. A deviation from the normal shape or size of a body part, resulting in disfigurement.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Inbreeding in the spirit of preserving the blood lines of nobility, or
  whatever, produces mental and physical deformity.
Pulmonary function testing may be useful to determine the impact of the
  deformity on the performance of the heart and lungs.
If not drained promptly, this can result in an abscess or a permanent deformity
  that causes a nasal blockage.
Worsening of the contracture may result in deformity and loss of function of
  the hand.
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