The Collaborative International Dictionary of English v.0.48:

Blanch \Blanch\ (bl[.a]nch), v. i.
   To grow or become white; as, his cheek blanched with fear;
   the rose blanches in the sun.
   [1913 Webster]

         [Bones] blanching on the grass.          --Tennyson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blanch \Blanch\, v. t. [See Blench.]
   1. To avoid, as from fear; to evade; to leave unnoticed.
      [Obs.]
      [1913 Webster]

            Ifs and ands to qualify the words of treason,
            whereby every man might express his malice and
            blanch his danger.                    --Bacon.
      [1913 Webster]

            I suppose you will not blanch Paris in your way.
                                                  --Reliq. Wot.
      [1913 Webster]

   2. To cause to turn aside or back; as, to blanch a deer.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blanch \Blanch\ (bl[.a]nch), v. t. [imp. & p. p. Blanched
   (bl[.a]ncht); p. pr. & vb. n. Blanching.] [OE. blanchen,
   blaunchen, F. blanchir, fr. blanc white. See Blank, a.]
   [1913 Webster]
   1. To take the color out of, and make white; to bleach; as,
      to blanch linen; age has blanched his hair.
      [1913 Webster]

   2. (Gardening) To bleach by excluding the light, as the
      stalks or leaves of plants, by earthing them up or tying
      them together.
      [1913 Webster]

   3. (Confectionery & Cookery)
      (a) To make white by removing the skin of, as by scalding;
          as, to blanch almonds.
      (b) To whiten, as the surface of meat, by plunging into
          boiling water and afterwards into cold, so as to
          harden the surface and retain the juices.
          [1913 Webster]

   4. To give a white luster to (silver, before stamping, in the
      process of coining.).
      [1913 Webster]

   5. To cover (sheet iron) with a coating of tin.
      [1913 Webster]

   6. Fig.: To whiten; to give a favorable appearance to; to
      whitewash; to palliate.
      [1913 Webster]

            Blanch over the blackest and most absurd things.
                                                  --Tillotson.
      [1913 Webster]

   Syn: To Blanch, Whiten.

   Usage: To whiten is the generic term, denoting, to render
          white; as, to whiten the walls of a room. Usually
          (though not of necessity) this is supposed to be done
          by placing some white coloring matter in or upon the
          surface of the object in question. To blanch is to
          whiten by the removal of coloring matter; as, to
          blanch linen. So the cheek is blanched by fear, i. e.,
          by the withdrawal of the blood, which leaves it white.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blanch \Blanch\, v. i.
   To use evasion. [Obs.]
   [1913 Webster]

         Books will speak plain, when counselors blanch.
                                                  --Bacon.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blanch \Blanch\, n. (Mining)
   Ore, not in masses, but mixed with other minerals.
   [1913 Webster]

WordNet (r) 3.0 (2006):

blanch
    v 1: turn pale, as if in fear [syn: pale, blanch, blench]
    2: cook (vegetables) briefly; "Parboil the beans before freezing
       them" [syn: blanch, parboil]

Moby Thesaurus II by Grady Ward, 1.0:

106 Moby Thesaurus words for "blanch":
   ache, achromatize, agonize, ail, anguish, bake, barbecue, baste,
   besnow, bleach, bleach out, blench, blush, boil, braise, brew,
   broil, brown, chalk, change color, coddle, color, cook, crimson,
   curry, darken, decolor, decolorize, devil, dim, discolor, do,
   do to perfection, drain, drain of color, dull, etiolate, fade,
   fade out, feel pain, feel the pangs, fire, flinch, flush,
   fricassee, frizz, frizzle, frost, fry, fume, glow, griddle, grill,
   grimace, grizzle, grow pale, have a misery, heat, hurt, look black,
   lose color, mantle, oven-bake, pale, pan, pan-broil, parboil,
   peroxide, poach, pound, prepare, prepare food, quail, redden,
   roast, saute, scallop, sear, shirr, shoot, shrink, silver, simmer,
   smart, squinch, start, steam, stew, stir-fry, suffer, tarnish,
   thrill, throb, tone down, turn color, turn pale, turn red,
   turn white, twinge, twitch, wan, wash out, white, whiten, wince,
   writhe