Source : Webster's Revised Unabridged Dictionary (1913)

Deformed \De*formed"\, a.
   Unnatural or distorted in form; having a deformity;
   misshapen; disfigured; as, a deformed person; a deformed
   head. -- {De*form"ed*ly}, adv. -- {De*form"ed*ness}, n.

Deform \De*form"\, v. t. [imp. & p. p. {Deformed}; p. pr. & vb.
   n. {Deforming}.] [L. deformare; de- + formare to form, shape,
   fr. forma: cf. F. d['e]former. See {Form}.]
   1. To spoil the form of; to mar in form; to misshape; to
      disfigure.

            Deformed, unfinished, sent before my time Into this
            breathing world.                      --Shak.

   2. To render displeasing; to deprive of comeliness, grace, or
      perfection; to dishonor.

            Above those passions that this world deform.
                                                  --Thomson.

Source : WordNet®

deformed
     adj : so badly formed or out of shape as to be ugly; "deformed
           thalidomide babies"; "his poor distorted limbs"; "an
           ill-shapen vase"; "a limp caused by a malformed foot";
           "misshapen old fingers" [syn: {distorted}, {ill-shapen},
            {malformed}, {misshapen}]