The Collaborative International Dictionary of English v.0.48:

Satin \Sat"in\, n. [F. satin (cf. Pg. setim), fr. It. setino,
   from seta silk, L. saeta, seta, a thick, stiff hair, a
   bristle; or possibly ultimately of Chinese origin; cf. Chin.
   sz-t["u]n, sz-twan. Cf. Sateen.]
   A silk cloth, of a thick, close texture, and overshot woof,
   which has a glossy surface.
   [1913 Webster]

         Cloths of gold and satins rich of hue.   --Chaucer.
   [1913 Webster]

   Denmark satin, a kind of lasting; a stout worsted stuff,
      woven with a satin twill, used for women's shoes.

   Farmer's satin. See under Farmer.

   Satin bird (Zool.), an Australian bower bird. Called also
      satin grackle.

   Satin flower (Bot.) See Honesty, 4.

   Satin spar. (Min.)
   (a) A fine fibrous variety of calcite, having a pearly
       luster.
   (b) A similar variety of gypsum.

   Satin sparrow (Zool.), the shining flycatcher (Myiagra
      nitida) of Tasmania and Australia. The upper surface of
      the male is rich blackish green with a metallic luster.

   Satin stone, satin spar.
      [1913 Webster]

WordNet (r) 3.0 (2006):

satin
    n 1: a smooth fabric of silk or rayon; has a glossy face and a
         dull back

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "satin":
   alabaster, attenuate, attenuated, billiard table, blubber,
   bowling alley, bowling green, breeze, butter, clay, cushion,
   daintiness, dainty, delicacy, delicate, dough, down, downiness,
   downy, eiderdown, feather bed, feathers, filminess, filmy, fine,
   fine-drawn, fine-grained, fine-grainedness, fineness, finespun,
   flat, fleece, floss, flue, fluff, fluffiness, fluffy, foam, fuzz,
   fuzziness, fuzzy, gauzy, glass, gossamer, gossameriness, gossamery,
   ice, ivory, kapok, level, mahogany, marble, peach fuzz, pillow,
   plane, plush, pubescence, pubescent, pudding, puff, putty, refined,
   refinement, rubber, satininess, satiny, silk, silkiness, silky,
   slide, smooth, smoothness, softness, swansdown, tennis court,
   thin-spun, thistledown, velutinous, velvet, velvetiness, velvety,
   wax, wiredrawn, wool, zephyr