The Collaborative International Dictionary of English v.0.48:

Argent \Ar"gent\, a.
   Made of silver; of a silvery color; white; shining.
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         Yonder argent fields above.              --Pope.
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The Collaborative International Dictionary of English v.0.48:

Argent \Ar"gent\, n. [F. argent, fr. L. argentum, silver; akin
   to Gr. 'a`rgyros silver, 'argo`s, 'argh`s, white, bright,
   Skr. rajata white, silver, raj to shine, Ir. arg white, milk,
   airgiod silver, money, and L. arguere to make clear. See
   Argue.]
   1. Silver, or money. [Archaic]
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   2. (Fig. & Poet.) Whiteness; anything that is white.
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            The polished argent of her breast.    --Tennyson.
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   3. (Her.) The white color in coats of arms, intended to
      represent silver, or, figuratively, purity, innocence,
      beauty, or gentleness; -- represented in engraving by a
      plain white surface. --Weale.
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WordNet (r) 3.0 (2006):

argent
    adj 1: of lustrous grey; covered with or tinged with the color
           of silver; "silvery hair" [syn: argent, silver,
           silvery, silverish]
    n 1: a metal tincture used in heraldry to give a silvery
         appearance