[1] : The Collaborative International Dictionary of English v.0.48

bobsled \bob"sled`\, bobsleigh \bob"sleigh`\, n.
   1. a short sled, mostly used as one of a pair connected by a
      reach or coupling; also, the compound sled so formed. u.
      s.
      1913 webster

            the long wagon body set on bobsleds.  --w. d.
                                                  howells.
      1913 webster

   2. a long racing sled for 2 or more people, having two
      pairs of runners, with the front pair connected to a
      steering mechanism. they are usually raced one at a time
      down a steeply sloping path or specially constructed
      chute, with sharp banked curves, and attain high speeds.

   syn: bobsled.
        wordnet 1.5 +pjc

[2] : WordNet (r) 2.0

bobsleigh
     n 1: formerly two short sleds coupled together syn: bobsled
     2: a long racing sled for 2 or more people with a steering
        mechanism syn: bobsled, bob
see also:
bobsled bob 

Bobsleigh >> B Words
Bobsleigh, definition of term: Bobsleigh
bobsleigh_pag1.html