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]