The Collaborative International Dictionary of English v.0.48:

Sleigh \Sleigh\, a.
   Sly. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sleigh \Sleigh\, n. [Cf. D. & LG. slede, slee, Icel. sle?i. See
   Sled.]
   A vehicle moved on runners, and used for transporting persons
   or goods on snow or ice; -- in England commonly called a
   sledge.
   [1913 Webster]

   Sleigh bell, a small bell attached either to a horse when
      drawing a slegh, or to the sleigh itself; especially a
      globular bell with a loose ball which plays inside instead
      of a clapper.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sleigh
    n 1: a vehicle mounted on runners and pulled by horses or dogs;
         for transportation over snow [syn: sled, sledge,
         sleigh]
    v 1: ride (on) a sled [syn: sled, sleigh]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "sleigh":
   Skimobile, Sno-Cat, blade, coast, flit, flow, fly, glide, glissade,
   ice-skate, roller-skate, runner, sail, sideslip, skate, skateboard,
   ski, skid, skim, sled, slide, slip, slither, snowmobile, sweep,
   toboggan, weasel