The Collaborative International Dictionary of English v.0.48:

Silvery \Sil"ver*y\, a.
   1. Resembling, or having the luster of, silver; grayish white
      and lustrous; of a mild luster; bright.
      [1913 Webster]

            All the enameled race, whose silvery wing
            Waves to the tepid zephyrs of the spring. --Pope.
      [1913 Webster]

   2. Besprinkled or covered with silver.
      [1913 Webster]

   3. Having the clear, musical tone of silver; soft and clear
      in sound; as, silvery voices; a silvery laugh.
      [1913 Webster]

   Silvery iron (Metal.), a peculiar light-gray fine-grained
      cast iron, usually obtained from clay iron ore.
      [1913 Webster]

WordNet (r) 3.0 (2006):

silvery
    adj 1: resembling or reminiscent of silver; "a soft silvern
           voice"; "singing in her silvery tones" [syn: silvern,
           silvery]
    2: having the white lustrous sheen of silver; "a land of silver
       (or silvern) rivers where the salmon leap"; "repeated
       scrubbings have given the wood a silvery sheen" [syn:
       silver, silvern, silvery]
    3: of lustrous grey; covered with or tinged with the color of
       silver; "silvery hair" [syn: argent, silver, silvery,
       silverish]

Moby Thesaurus II by Grady Ward, 1.0:

159 Moby Thesaurus words for "silvery":
   Quaker-colored, achingly sweet, acier, agreeable,
   agreeable-sounding, appealing, argent, argentine, ariose, arioso,
   ashen, ashy, aureate, brass, brassy, brazen, brilliant, bronze,
   bronzy, canescent, canorous, cantabile, catchy, chalky, cinereous,
   cinerous, copper, coppery, cretaceous, cupreous, cuprous, dapple,
   dapple-gray, dappled, dappled-gray, dingy, dismal, dove-colored,
   dove-gray, dreary, dulcet, dull, dusty, euphonic, euphonious,
   euphonous, ferrous, ferruginous, fine-toned, fleecy-white, frosted,
   frosty, gilt, glaucescent, glaucous, glittering, gold, gold-filled,
   gold-plated, golden, golden-tongued, golden-voiced, gray,
   gray-black, gray-brown, gray-colored, gray-drab, gray-green,
   gray-spotted, gray-toned, gray-white, grayed, grayish, griseous,
   grizzle, grizzled, grizzly, hoar, hoary, honeyed, iron, iron-gray,
   ironlike, lactescent, lead, lead-gray, leaden, lily-white, livid,
   marble, marmoreal, melic, mellifluent, mellifluous, mellisonant,
   mellow, melodic, melodious, mercurial, mercurous, milky,
   mouse-colored, mouse-gray, mousy, music-flowing, music-like,
   musical, nickel, nickelic, nickeline, niveous, pearl, pearl-gray,
   pearly, pewter, pewtery, platinum, pleasant, pleasant-sounding,
   pure white, quicksilver, rich, sad, shimmering, shining, silver,
   silver-gray, silver-plated, silver-toned, silver-tongued,
   silver-voiced, silvered, singable, slate-colored, slaty,
   smoke-gray, smoky, snow-white, snowy, sober, somber, songful,
   songlike, sonorous, steel, steel-gray, steely, stone-colored,
   swan-white, sweet, sweet-flowing, sweet-sounding, taupe, tin,
   tinny, tunable, tuneful, white, white as snow