Source : Webster's Revised Unabridged Dictionary (1913)

Dusty \Dust"y\, a. [Compar. {Dustier}; superl. {Dustiest}.] [AS.
   dystig. See {Dust}.]
   1. Filled, covered, or sprinkled with dust; clouded with
      dust; as, a dusty table; also, reducing to dust.

            And all our yesterdays have lighted fools The way to
            dusty death.                          --Shak.

   2. Like dust; of the color of dust; as a dusty white.

   {Dusty miller} (Bot.), a plant ({Cineraria maritima}); -- so
      called because of the ashy-white coating of its leaves.

Source : WordNet®

dusty miller
     n 1: shrubby perennial of the Canary Islands having white flowers
          and leaves and hairy stems covered with dustlike down;
          sometimes placed in genus Chrysanthemum [syn: {silver-lace},
           {silver lace}, {Tanacetum ptarmiciflorum}, {Chrysanthemum
          ptarmiciflorum}]
     2: stiff much-branched perennial of the Mediterranean region
        having very white woolly stems and leaves; sometimes
        placed in genus Cineraria [syn: {Senecio cineraria}, {Cineraria
        maritima}]
     3: a plant having leaves and stems covered with down that
        resembles dust [syn: {Centaurea cineraria}, {Centaurea
        gymnocarpa}]
     4: herb with grayish leaves found along the east coast of North
        America; used as an ornamental plant [syn: {beach wormwood},
         {old woman}, {Artemisia stelleriana}]
     5: an old cottage garden plant of southeastern Europe widely
        cultivated for its attractive white woolly foliage and
        showy crimson flowers [syn: {mullein pink}, {rose campion},
         {gardener's delight}, {Lychnis coronaria}]