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]