1. 
2. 
[syn: swimmer, natator, bather]
The Collaborative International Dictionary of English v.0.48:
Swimmer \Swim"mer\, n.
   1. One who swims.
      [1913 Webster]
   2. (Far.) A protuberance on the leg of a horse.
      [1913 Webster]
   3. (Zool.) A swimming bird; one of the natatores.
      [1913 Webster]
   Little swimmer (Zool.), a phalarope.
      [1913 Webster]
WordNet (r) 3.0 (2006):
swimmer
    n 1: a trained athlete who participates in swimming meets; "he
         was an Olympic swimmer"
    2: a person who travels through the water by swimming; "he is
       not a good swimmer" [syn: swimmer, natator, bather]