The Collaborative International Dictionary of English v.0.48:

Powder \Pow"der\, v. t. [imp. & p. p. Powdered; p. pr. & vb.
   n. Powdering.] [F. poudrer.]
   1. To reduce to fine particles; to pound, grind, or rub into
      a powder; to comminute; to pulverize; to triturate.
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   2. To sprinkle with powder, or as with powder; to be
      sprinkle; as, to powder the hair.
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            A circling zone thou seest
            Powdered with stars.                  --Milton.
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   3. To sprinkle with salt; to corn, as meat. [Obs.]
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The Collaborative International Dictionary of English v.0.48:

Powdered \Pow"dered\, a.
   1. Reduced to a powder; sprinkled with, or as with, powder.
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   2. Sprinkled with salt; salted; corned. [Obs.]
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            Powdered beef, pickled meats.         --Harvey.
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   3. (Her.) Same as Sem['e]. --Walpole.
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WordNet (r) 3.0 (2006):

powdered
    adj 1: consisting of fine particles; "powdered cellulose";
           "powdery snow"; "pulverized sugar is prepared from
           granulated sugar by grinding" [syn: powdered,
           powdery, pulverized, pulverised, small-grained,
           fine-grained]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "powdered":
   branny, chalklike, chalky, comminute, comminuted, crushed,
   detrital, detrited, disintegrated, dotted, dusted, dusty,
   efflorescent, farinaceous, fine, flaky, floury, furfuraceous,
   gone to dust, grated, ground, impalpable, levigated, mealy, milled,
   peppered, pestled, powdery, pulverant, pulverized, pulverulent,
   reduced to powder, scaly, scobicular, scobiform, scurfy, sharded,
   shredded, spattered, specked, speckled, splattered, spotted,
   sprinkled, studded, triturated