Source : Webster's Revised Unabridged Dictionary (1913)

Blemish \Blem"ish\, n.; pl. {Blemishes}.
   Any mark of deformity or injury, whether physical or moral;
   anything that diminishes beauty, or renders imperfect that
   which is otherwise well formed; that which impairs
   reputation.

         He shall take two he lambs without blemish, and one ewe
         lamb of the first year without blemish.  --Lev. xiv.
                                                  10.

         The reliefs of an envious man are those little
         blemishes and imperfections that discover themselves in
         an illustrious character.                --Spectator.

   Syn: Spot; speck; flaw; deformity; stain; defect; fault;
        taint; reproach; dishonor; imputation; disgrace.

Blemish \Blem"ish\, v. t. [imp. & p. p. {Blemished}; p. pr. &
   vb. n. {Blemishing}.] [OE. blemissen, blemishen, OF. blemir,
   blesmir, to strike, injure, soil, F. bl[^e]mir to grow pale,
   fr. OF. bleme, blesme, pale, wan, F. bl[^e]me, prob. fr. Icel
   bl[=a]man the livid color of a wound, fr. bl[=a]r blue; akin
   to E. blue. OF. blemir properly signifies to beat one (black
   and) blue, and to render blue or dirty. See {Blue}.]
   1. To mark with deformity; to injure or impair, as anything
      which is well formed, or excellent; to mar, or make
      defective, either the body or mind.

            Sin is a soil which blemisheth the beauty of thy
            soul.                                 --Brathwait.

   2. To tarnish, as reputation or character; to defame.

            There had nothing passed between us that might
            blemish reputation.                   --Oldys.

Source : WordNet®

blemish
     n : a mark or flaw that spoils the appearance of something
         (especially on a person's body); "a facial blemish" [syn:
          {defect}, {mar}]
     v 1: mar or spoil the appearance of; "scars defaced her cheeks";
          "The vandals disfigured the statue" [syn: {deface}, {disfigure}]
     2: mar or impair with a flaw; "her face was blemished" [syn: {spot}]
     3: add a flaw or blemish to; make imperfect or defective [syn:
        {flaw}]