Source : Webster's Revised Unabridged Dictionary (1913)

Defect \De*fect"\, n. [L. defectus, fr. deficere, defectum, to
   desert, fail, be wanting; de- + facere to make, do. See
   {Fact}, {Feat}, and cf. {Deficit}.]
   1. Want or absence of something necessary for completeness or
      perfection; deficiency; -- opposed to superfluity.

            Errors have been corrected, and defects supplied.
                                                  --Davies.

   2. Failing; fault; imperfection, whether physical or moral;
      blemish; as, a defect in the ear or eye; a defect in
      timber or iron; a defect of memory or judgment.

            Trust not yourself; but, your defects to know, Make
            use of every friend -- and every foe. --Pope.

            Among boys little tenderness is shown to personal
            defects.                              --Macaulay.

   Syn: Deficiency; imperfection; blemish. See {Fault}.

Defect \De*fect"\, v. i.
   To fail; to become deficient. [Obs.] ``Defected honor.''
   --Warner.

Defect \De*fect"\, v. t.
   To injure; to damage. ``None can my life defect.'' [R.]
   --Troubles of Q. Elizabeth (1639).

Source : WordNet®

defect
     n 1: an imperfection in a bodily system; "visual defects"; "this
          device permits detection of defects in the lungs"
     2: a failing or deficiency; "that interpretation is an
        unfortunate defect of our lack of information" [syn: {shortcoming}]
     3: an imperfection in a device or machine; "if there are any
        defects you should send it back to the manufacturer" [syn:
         {fault}, {flaw}]
     4: a mark or flaw that spoils the appearance of something
        (especially on a person's body); "a facial blemish" [syn:
        {blemish}, {mar}]

defect
     v : desert (a cause, a country or an army), often in order to
         join the opposing cause, country, or army; "If soldiers
         deserted Hitler's army, they were shot" [syn: {desert}]

Source : Free On-Line Dictionary of Computing

defect
     
        {bug}