The Collaborative International Dictionary of English v.0.48:

Silky \Silk"y\, a. [Compar. Silkier; superl. Silkiest.]
   1. Of or pertaining to silk; made of, or resembling, silk;
      silken; silklike; as, a silky luster.
      [1913 Webster]

   2. Hence, soft and smooth; as, silky wine.
      [1913 Webster]

   3. Covered with soft hairs pressed close to the surface, as a
      leaf; sericeous.
      [1913 Webster]

   Silky oak (Bot.), a lofty Australian tree (Grevillea
      robusta) with silky tomentose lobed or incised leaves. It
      furnishes a valuable timber.
      [1913 Webster]

WordNet (r) 3.0 (2006):

silky
    adj 1: having a smooth, gleaming surface reflecting light;
           "glossy auburn hair"; "satiny gardenia petals"; "sleek
           black fur"; "silken eyelashes"; "silky skin"; "a silklike
           fabric"; "slick seals and otters" [syn: satiny,
           sleek, silken, silky, silklike, slick]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "silky":
   attenuate, attenuated, buffed, burnished, capillary, cirrose,
   cirrous, cottony, dainty, deferential, delicate, disarming, downy,
   fibered, fibroid, fibrous, filmy, fine, fine-drawn, fine-grained,
   finespun, finished, flagelliform, flossy, fluffy, funicular,
   furbished, fuzzy, gauzy, glace, glassy, glazed, gleaming, glossy,
   gossamer, gossamery, hairlike, hairy, insinuating, insinuative,
   lacquered, ligamental, lustrous, plush, plushy, polished,
   pubescent, refined, ropy, rubbed, saccharine, satin, satinlike,
   satiny, sericeous, shellacked, shiny, silken, silklike, sleek,
   slick, smooth, soft, soft as silk, stringy, taeniate, taeniform,
   thin-spun, threadlike, thready, varnished, velutinous, velvetlike,
   velvety, wiredrawn, wiry